陆晔。command n. ability to use or control sth. 掌握， 运用能力。
a command of computers 精通电脑。
she has an impressive command of the english language.
她对英语的熟练程度是令人难忘的。
sustained a. continuing for a long time 持久的，坚持不懈的。
sustain vt. make (sth.) continue to exist or happen for a period of time 保持， 使继续下去。
the president’s speech was greeted by sustained applause.
人们对**的演讲报以经久不息的掌声。
sustained 是过去分词作形容词用，它的动词原型是 sustain，意为“支撑、维持”。
the thought of getting home was the only thing that sustained me in the hospital.
在医院里，唯一让我支撑下去的就是回家的想法。
helpful a. useful and able to improve a particular situation; (of a person) willing to help
有帮助的； 乐于助人的。
she’s such a pleasant, helpful child!
她真是个令人愉快，乐于助人的孩子。
he made several helpful suggestions.
他提出了好几个有用的建议。
complain v. say that you are annoyed, not satisfied, or unhappy about sth. or sb. 抱怨。
he complains about anything — his job, his wife, his back …
他什么都要抱怨 — 工作、妻子、背痛 …
us soldiers complained of low morale in iraq.
美国士兵抱怨在伊拉克士气低落。
memorize vt. learn (sth.) so that you remember it perfectly 记住，背熟。
he studied his map, trying to memorize the way to rose's street.
他仔细研究了地图，试图记住去罗斯街的路。
memorize vt. learn (sth.) so that you remember it perfectly 记住，背熟。
he studied his map, trying to memorize the way to rose's street.
他仔细研究了地图，试图记住去罗斯街的路。
remember 表示记得，多指无意识地回忆起往事。
he remembers every detail of that occurrence as though it happened yesterday.
那件事前前后后他都记得一清二楚，仿佛发生在昨天一样。
recall 指想方设法回忆已经遗忘之事。
i seem to recall i've met him before somewhere.
我好像以前在**见过他。
can you recall what happened last night?
你能回想起昨晚发生了什么事吗？
remind 指经某人或某事的提醒而回忆起某件已遗忘之事。
if i forget, please remind me.
如果我忘了，请提醒我。
your hair and eyes remind me of your mother.
你的头发和眼睛使我联想起你的母亲。
cram vt. make (sth.) too full; force (sth.) into a small space 把 … 塞满；把 … 塞进。
a lot of information has been crammed into this book.
这本书容纳了大量的信息。
36,000 spectators crammed into the stadium to see the game.
三万六千名观众挤进运动场**比赛。
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