Perco hf alkylation

Hf

[医] 铃(72号元素)

alkylation

n. 烷化作用, 烷化\\n[化] 烷基化; 烷基取代

Please come in, Mr. Wilson.

请进，威尔逊先生。

Yes, I got dressed and had breakfast.

是,我穿好衣服了并且吃了早餐。

OK, everyone. Less noise, please! Gather round and listen carefully. First we are going to search the beach and the rock pools. Let me remind you what we are looking for: seaweeds, fish, plants, all living things. When you find anything, make a note where

00在这里集合，游泳之后再吃午餐。别着急！我们有足够的时间。