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Or, to be more exact, Alaska was at one time connected with the tip of Siberia.

to be more exact，这是句中的插入语，英语中的插入语是很多的，常用作独立成分。

Which of the following expressions does NOT mean to be really dressed up in very nice clothes?

不对。如果一个人dressed to kill 那就是说穿上了最好的衣服，非常漂亮。。

It's probable for her to be in a bad temper.

该结构中的介词for原则上不能换成to，但在某些特殊结构中可以换成

She used to be terrified of being alone.

used to 是本课主要的语言点，意思是"过去常常"，表示过去的习惯动作或过去常常存在的状态，仅用于一般过去时。

Things you blow off, such as something you don't want to do.

L： 我不想做什么事，也可以用to blow off。

All the people of whom you and I are the rag-tag and bobtail, all the camp followers of western civilization, we have taken it for granted that even if we did not live up to those exalted ethical standards, we did a great deal better than anyone else.

我们所有的人，包括你和我这样的下层平民，以及所有西方文明的依附者都认为，即使我们尚未达到那些崇高的道德标准，我们也还是是比别的任何人都干得好得多。；He was exalted to the position of general manager。

Recent years, P2P (peer-to-peer), as a bran-new technology, has developed whip and spur.

近几年来，P2P(peer-to-peer，对等网络)作为一项全新的网络技术飞速发展。

The HCl Liquefaction area is used to provide a buffer inventory of HCl in order that the start-up and then subsequent operation of the cMDI Plant is de-coupled from the Oxychlorination Plant downstream.

我是这样译的：HCl液化单元提供HCl 缓冲存量，以便cMDI装置开工及其后续操作与下游的氧氯化装置脱开。is used to表被动，意为"用于，用来"，在这里还是不译出的好。

Americans still use the expression "to bulldoze" but mainly in political situations.

美国仍然使用"to bulldoze"这个词来表达，但主要用在政治形势中。

Help 一般用法: can't help doing; help to do; be of help

特殊注意： help后面的动词不定式的to可以省略。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。