Instead of flushing with water, you use a dry substance.
不用水冲，而是改用一种干燥物质冲洗。
And if you use too much humour, others may think you have no substance.
而且如果你开太多玩笑，别人可能会认为你没有内涵。
Never use butter or other fatty or oily substance on a burn.
不要将黄油或其他含脂肪和油脂的东西涂于患处。
It is often convenient to use the mole to describe the amount of substance.
用摩尔来表示物质的量通常是很方便的。
Use a mixture containing approximately 5 per cent of the substance, unless otherwise specified.
除另有规定外，混合物中约含5%被测物。
Use a mixture containing approximately 5 per cent of the substance, unless otherwise specified.
除另有规定外，混合物中约含5%被测物。
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