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1·Less dense substances move upwards to form a crust.

密度小的物质向上浮动并形成一层皮。《牛津词典》

2·Most of these nourishing substances are in the yolk of the egg.

这些营养物质大部分在蛋黄里。《柯林斯英汉双解大词典》

3·These are substances which specifically latch onto the protein on the cell membrane.

这些是专门黏附在细胞膜蛋白质上的物质。《柯林斯英汉双解大词典》

4·Emotional upsets generate powerful and deadly toxic substances.

情绪的不安会产生强大而致命的有害物质。

5·Imagine what these poisonous substances can do to your own body.

想象一下这些有毒物质会对你的身体造成什么影响。

6·These substances leak from the rusty barrels and pollute the soil.

这些物质从生锈的桶中渗出，然后污染了土壤。

7·The process allows many poisonous substances to escape into the environment.

这个过程让许多有毒物质进入到了自然环境中。

8·All substances, whether they are gaseous, liquid or solid, are made of atoms.

一切物质，不论它们是气体、液体还是固体，都是由原子构成的。《新英汉大辞典》

9·They don't realize that familiar substances such as alcohol and tobacco are also drugs.

他们没有意识到像酒精和烟草这样熟悉的物质也是毒品。

10·They don't realize that familiar substances such as alcohol and tobacco are also drugs.

他们没有意识到像酒精和烟草这样熟悉的物质也是毒品。

(1)in substance实质上；基本上；事实上

(1)organic substance有机物；有机物质

(1)active substance活性物质；放射性物质；有效物质

(1)substance abuse物质滥用；滥用药物

(1)mineral substance矿物质

(1)suspended substance悬浮物