Acid medium

acid ['æsɪd]

adj. 酸味的;尖刻的;酸的;酸性的; n. <化>酸;酸味物质;

acid尖，酸，锐利 →酸；酸的，酸性的

medium ['midɪəm]

adj. 中等的，中级的;普通的;平均的;半生熟的; n. 媒介物，媒质;中间，中庸，[生]培养基，培养液，颜料溶解液，[数]中数，平均，[逻]中名辞;手段，方法;中间物;

medi中间+um表名词→中间物，媒介

I'm very proud of you. You really did a beautiful job.

我真以你为傲。你真的拍得很漂亮。

I tried to call Mr. Cooper,but the line was busy.

我试着呼叫库珀先生，但是线老是忙。

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。