enhancer n. [C] （某物的）提高物；增強物enhanced adj. 提高的；增高的
enhancement n. [U] 提高；增加
performance-enhancing drug （運動員非法使用來讓表現更好的）興奮劑、禁藥等
例： You should do all you can to enhance your chances of victory.
The music on this CD is a good mood enhancer.
It always cheers me up when I’m down.
Your promotion means not just higher pay but enhanced responsibilities as well.
We need a conference room with a sound enhancement system.
Half of the winners tested positive for performance-enhancing drugs.
24. concentration n. [U] 專心；全神貫注
concentrate v. [T, I] 集中（注意力等）；專注
concentrate n. [U, C] 濃縮物
concentrated adj. 專心的；集中的；濃縮的（用於名詞前）
concentration camp （納粹）集中營
concentrate attention/efforts/energy on 集中注意力／心力／精力於
concentrate on全神貫注於
例：This fruit juice is a concentrate. You have to dilute it with water before you drink it.
The students are making a concentrated effort to prepare for their entrance exams.
This product contains concentrated apple juice.
The Nazi concentration camps remain an irremovable stigma in German history.
Can you take the kids to the park for a few hours so that I can concentrate on my work?
26. recollect v. [T] 記起；回憶
recollection n. [C] 回憶；回憶起的事物
recollect + N/V-ing 記起某事
recollect + wh-clause 記起某事
recollect + that ... 記起某事
have no recollection of something 記不得某事
to (the best of) my recollection 就我所記得的
例：Whenever he could recollect some treasured memories of his youth, he would write them down.
I don’t recollect who told me about their divorce.
The old lady has no recollection of how she got to the hospital.
To the best of my recollection, they have never been on friendly terms with each other.
27. remarkable adj. 非凡的；卓越的
remarkably adv. 明顯地；非常地
remark v. [I, T] 說，評論
remark n. [C] 話語，評論
a remarkable accomplishment/achievement/feat 非凡的成就
it is remarkable that ... ……是很了不起的
be remarkable for sth. 以……（特色）而引人注目
例：He has made remarkable progress in his writing since the last time I read his work.
Remarkably, nobody was killed in the automobile accident.
Sharon plays the piano remarkably well.
Roberta remarked that the actor was gorgeous, but I disagreed.
The host’s concluding remarks were very good.
It is remarkable that Mr. Johnson built a house single-handedly in three months.
Mr. Ambrose’s novels are remarkable for their historical accuracy.
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