A pH test measures the acidity or alkalinity of a substance.

pH值测试可检测物质的酸碱度。

柯林斯例句

A catalyst is a substance which speeds up a chemical reaction.

催化剂是一种能加速化学反应的物质.

《简明英汉词典》

The action of heat will separate the chemical into a substance and oxygen.

热的作用会把这化学药品分解成氧气和另一种物质.

《简明英汉词典》

It is a substance called caffeine.

这种物质就是咖啡因.

英语晨读30分（高一）

The more ways a substance has of'soaking up " added energy.

物质具有 “ 吸收 ” 所加入能量的其它方式.

辞典例句

Fertilizer is a substance put on land to fertilize it.

肥料是施在地里使之肥沃的物质.

辞典例句

The term " fluid " means a substance that can flow.

所谓 “ 流体 ” 是指可流动的物质.

辞典例句

Charge may be given to or removed from a substance.

电荷可以充入一物质也可以从中移去.

辞典例句

A substance donates protons to some other substance.

一物质向其他物质提供质子.

辞典例句

Such a substance is called a depolarizer.

这种物质称为去极剂.

辞典例句

A species of cockroach sprays a substance , ethylacrolein, that is a kind of tear gas.

某种蟑螂喷射一种催泪性毒气――乙 基丙烯 醛.

辞典例句

The temperature of a substance may be changed under a variety of conditions.

物质的温度可在不同条件下发生变化.

辞典例句

He was studying a substance in the hull that covers rice.

他在研究稻壳中的一种物质.

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The microcapsules are suspended in a substance similar to vegetable cooking oil.

微型封装块悬浮在像食用油那样的物质中.

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My duodenum produces a substance called secretion, which empties into Joe's bloodstream.

我的十二指肠生产一种名叫分泌素的物质, 排入乔的血流.

辞典例句