Essential amino acid

essential [ɪ'sɛnʃl]

adj. 基本的;必要的;本质的;精华的; n. 必需品;基本要素;必不可少的东西;

essent=be存在，本质 + ial ...的 → 必要的，本质的

amino

a. 氨基的\\n[医] 氨基

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

Your car's very noisy. The muffler must be damaged.

你的车噪音真大，消声器一定出毛病了。

That's unbelievable.

那是难以置信的。

You were very kind. You brought out all your jewellery and you told me I could take anything I wanted. There were so many beautiful things that it was hard to choose. And then I saw a lovely diamond necklace with a big blue stone in the centre.

你太好了。当时你把所有的珠宝首饰全都拿了出来，而且说，我要什么就可以拿什么。漂亮的首饰太多了，实在难挑选。后来我终于看中了一条美丽的钻石项链，中间还嵌着一颗大蓝宝石。