The hydrophilic suspending plastic filler was made by adding some water-soluble polymer to plastic.

通过在普通塑料中添加水溶性高分子物进行亲水性改性，制得亲水性塑料悬浮填料。

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This paper also indicated that the yield of formaldehyde may be increased obviously by adding some water to methylal.

文中提出在原料中添加适量水可以显著提高甲醛收率。

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Reduce the heat to medium-low, cover the pot, and simmer the meatballs for 2 hours, adding some water if necessary to keep the mixture from sticking to the bottom of the pot.

将肉丸添加到煮沸的白菜汤中，减弱火势至中低档，盖上锅盖，再慢煮的肉丸汤2小时，如果需要，可添加水，以保证汤料混合物不沾锅底。

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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