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1、occur
发生
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果只是在晚上头疼，那常常是由于缺乏新鲜空气和氧气的缘故。
The crash occurred when the crew shut down the wrong engine.
机务人员关错了引擎，随即飞机坠毁。
存在；出现；有
The cattle disease occurs more or less anywhere in Africa where the fly occurs.
在非洲凡是有这种蝇虫的地方，几乎都会出现这一牛病。
These snails do not occur on low-lying coral islands or atolls.
在地势低平的珊瑚岛或环礁上没有这种螺。
（想法或主意）被想到，被想起，浮现于脑海中
It did not occur to me to check my insurance policy.
我没有想到要核实我的保险单条款。
It occurred to me that I could have the book sent to me.
我想到可以让人把书寄给我。
2、official
官方的；正式的
According to the official figures, over one thousand people died during the revolution.
根据官方数字，1,000多人在这场革命中丧生。
An official announcement is expected in the next few days.
预计过几天会发布一项正式声明。
公务的；公职的；公事的
The President is in Brazil for an official two-day visit.
总统正在巴西进行为期两天的正式访问。
（解释、理由等）冠冕堂皇的，桌面上的
The official explanation for the cancellation of the party conference is that there are no premises available.
官方对取消此次政党会议作出的解释是没有场地。
The official reason given for the President's absence was sickness.
对外公布的总统未到场原因是身体有恙。
3、expect
预期;预料;期待
a council workman who expects to lose his job in the next few weeks.
预计自己在接下来的几周里会丢掉工作的市政工人
They no longer expect corporate profits to improve.
他们不再期待公司利润会增长。
盼望;期待;等待
I am expecting several important letters but nothing has arrived.
我正在等几封重要的信件，可是一封都没到。
I wasn't expecting a visitor.
我没想到会有人来访。
要求；认为应当得到;指望
He wasn't expecting our hospitality.
他没有指望我们会盛情款待。
I do expect to have some time to myself in the evenings.
我确实希望晚上能有些属于自己的时间。
