You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.

在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。

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And it's crucial - they say - to drink it within 30 minutes to prevent the complex mix of chemicals that give the drink its refreshing kick from breaking down.

他们说，最最关键的一点，是要在三十分钟内喝完，这样给予血腥玛丽醒酒功效的复杂化学混合物才不会流失。

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It is effective to prevent concrete splitting open for coal ash to mix into big cubage concrete in proportion.

在大体积混凝土中掺入一定比例的粉煤炭可有效地防止混凝土裂缝。

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The U.S. military broke the protest by strapping detainees down and force-feeding them a liquid nutrient mix to prevent them from starving themselves to death.

NPR: Yemenis Demand Release Of Guantanamo Detainees

Three men were at the hospital being treated for dehydration and 11 were being force-fed with a liquid nutrient mix to prevent dangerous weight loss.

NPR: Striking Guantanamo Prisoners Say Water Denied

BPA, as its known, is a chemical used to make the epoxy mix that line canned goods and prevent them from spoilage, preserving canned goods and saving tens of thousands of lives every year.

FORBES: The science of BPA