1.accretion n.增長( the process of growth or enlargement by a gradual build-up)；增加物( added matter or thing formed by the addition of such matter)

詞根記憶：ac+cret(增加)+ion一增長

例:accretion disks吸積盤//This continuous process of accretion and succession would be interrupted only by hurricanes or storm flushings.

2.accrue v.自然增長，自然產生( to come about as a natural growth,increase, or advantage)

詞根記憶：ac+crue(增加)--自然增長，自然產生

例:The benefits would accrue to the individual, while the costs would be spread among all users.

派生詞:accrual(n.獲利：自然增長)

3.accumulate v.積累( to gather or pile up)；堆積(to amass)

詞根記憶：ac（不斷）+cumul（堆積）+ate(使)一使不斷堆積起來一積累

例:Recyclable trash that is allowed to accumulate for two weeks will attract rodents(嚙齒動物)．

派生詞:accumulation(n.集聚;積累)

4.accuracy n.準確（性），精確（性）( exactness)

詞根記憶：ac(加強)+cur(注意)+acy(表性質)一十分注意一準確

例:The accrnacy of animals memories is difficult to determine through direct experimentation.

派生詞:inaccuracy(n.誤差，錯誤)

5.accurate a.正確的( correct)：精確的(exact)

例:Sailors needed highly accurate timepieces in order to compute their longitude.

派生詞:inaccurate(a.不準確的)；accurately(ad.正確地：精確地)

6.accustomed a.(to)習慣的，適應的(adapted to existing conditions)

詞根記憶：ac+custom(習慣，習俗)+ed 一習慣的

例:The recent immigrants have not yet become accustomed to American food.

7.acidity n.酸度，酸性( the quality, state, or degree of being acid)

詞根記憶：acid(酸)+ity（名詞后綴）一酸度

例:The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality.

8.acknowledge v.承認( to recognize as genuine or valid)；致謝(to express gratitude)

詞根記憶:ac+knowledge(知道)一人人都知道，不得不承認一承認

例:Womens oral histories acknovdedge the influence of well-known women.

派生詞:acknowledgement(n.承認；感謝)

9.acoustic a.聽覺的，有關聲音的( having to do with hearing or sound)

例:The use of acoustic alarms increases the number of commercial fish caught by the fishing companys boats.

派生詞:acoustics(n.聲學)

10.acoustical a.聲學的，聽覺的(of or relating to the sense or organs of hearing, to sound, or to the science of sounds)

詞根記憶:來自acoustic(a.聲學的；音響的)

例:The male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals.

派生詞:acoustically( ad.聽覺上;聲學上)

1.accretion n.增長( the process of growth or enlargement by a gradual build-up)；增加物( added matter or thing formed by the addition of such matter)

詞根記憶：ac+cret(增加)+ion一增長

例:accretion disks吸積盤//This continuous process of accretion and succession would be interrupted only by hurricanes or storm flushings.

2.accrue v.自然增長，自然產生( to come about as a natural growth,increase, or advantage)

詞根記憶：ac+crue(增加)--自然增長，自然產生

例:The benefits would accrue to the individual, while the costs would be spread among all users.

派生詞:accrual(n.獲利：自然增長)

3.accumulate v.積累( to gather or pile up)；堆積(to amass)

詞根記憶：ac（不斷）+cumul（堆積）+ate(使)一使不斷堆積起來一積累

例:Recyclable trash that is allowed to accumulate for two weeks will attract rodents(嚙齒動物)．

派生詞:accumulation(n.集聚;積累)

4.accuracy n.準確（性），精確（性）( exactness)

詞根記憶：ac(加強)+cur(注意)+acy(表性質)一十分注意一準確

例:The accrnacy of animals memories is difficult to determine through direct experimentation.

派生詞:inaccuracy(n.誤差，錯誤)

5.accurate a.正確的( correct)：精確的(exact)

例:Sailors needed highly accurate timepieces in order to compute their longitude.

派生詞:inaccurate(a.不準確的)；accurately(ad.正確地：精確地)

6.accustomed a.(to)習慣的，適應的(adapted to existing conditions)

詞根記憶：ac+custom(習慣，習俗)+ed 一習慣的

例:The recent immigrants have not yet become accustomed to American food.

7.acidity n.酸度，酸性( the quality, state, or degree of being acid)

詞根記憶：acid(酸)+ity（名詞后綴）一酸度

例:The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality.

8.acknowledge v.承認( to recognize as genuine or valid)；致謝(to express gratitude)

詞根記憶:ac+knowledge(知道)一人人都知道，不得不承認一承認

例:Womens oral histories acknovdedge the influence of well-known women.

派生詞:acknowledgement(n.承認；感謝)

9.acoustic a.聽覺的，有關聲音的( having to do with hearing or sound)

例:The use of acoustic alarms increases the number of commercial fish caught by the fishing companys boats.

派生詞:acoustics(n.聲學)

10.acoustical a.聲學的，聽覺的(of or relating to the sense or organs of hearing, to sound, or to the science of sounds)

詞根記憶:來自acoustic(a.聲學的；音響的)

例:The male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals.

派生詞:acoustically( ad.聽覺上;聲學上)