【例句】The police are doing everything possible to ascertain his whereabouts.
警方正在尽全力查明他的下落。

【例句】A sheet of metal was shaken to simulate the noise of thunder.
摇动一块金属片可以模拟雷声。

【例句】A rare skin condition has baffled doctors for decades.
一种罕见的皮肤病困扰了医生们几十年。

【例句】The detective tried to ascertain the facts about the robbery.
侦探试图查明这起抢劫的真相。

【例句】He drew an analogy between the brain and a powerful computer.他把人脑与功能强大的电脑做类比。

【例句】Marxist theory is not a dogma but a guide to action.
马克思主义理论从来不是教条而是行动的指南。

【例句】Wars in the region have depleted the country's food supplies.
该地区的战争耗尽了该国的粮食供应。

【例句】If water pipes are damaged , shut off the supply at the main valve.
如果水管破裂，请在主动阀处切断水流。

【例句】The apple pie crust should be crisp and golden brown.
苹果馅饼的皮应该口感酥脆，色泽金黄