Centre of flotation

centre ['sentər]

n. 中心;（市镇的）中心区;中心点;中枢; vt.& vi. 置于中央;集中;把…当作中心;（使）成为中心;

of [əv]

prep. 关于;属于…的;由…制成; aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];

flotation

[化] 浮; 浮游选矿\\n[医] 浮集(法), 浮选(法)

Oh, Grandpa!

啊，爷爷！

How much is the salary a month?

每月薪水多少？

Other books are for reading slowly and carefully. If it is a book on a subject that you are interested in, you will want to chew and digest it. That does not mean reading it too slowly. When you pick up a book for the first time, check that it is not to

还有一些书是要慢慢地、仔细地阅读的。如果有一本书谈论的题目你很感兴趣，你就想“咀嚼、消化它”。这并不意味着要读得太慢。当你第一次拿起一本书的时候，你得检查一下，这本书不是太难读。除非从头几页书中你能看出这是一本你容易读懂的书，否则你就不要去读它。