The water can be softened by adding a chemical.

添加化学品能使水变软。

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Melamine, a chemical used in the making of plastic, was found in the baby formula; it later emerged that unscrupulous manufacturers had been adding it to food products to cheaply boost protein values.

这类奶粉中发现含有三聚氰胺，它是一种制造塑料的化学物质，后来被无良厂家添加到食品里以降低向其中添加蛋白质的成本。

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Changes in the input voltage lower the barrier and increase current flow in transistors, just as adding an enzyme to a chemical reaction speeds it up.

改变输入电压能降低屏障并增加晶体管电流，正如加入酶使化学反应加速一样。

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Some scientists have proposed adding chemical tracers to fracking fluids as a way of confirming that any contamination of drinking water comes from the drilling process.

BBC: Fracking: Untangling fact from fiction

They then triggered them into action using a chemical called an interleukin, or cigarette smoke before adding resveratrol.

BBC: NEWS | Health | Red wine 'may treat lung disease'

"We are following all leads concerning chemical weapons, " the foreign minister said, adding that the consolidation was a measure to assuage fears that such weapons could end up in "the wrong hands, " the agency reported.

CNN: Russia: Syria consolidates its chemical weapons