She needed a clear head to carry out her instructions.

她需要一个清醒的头脑来执行命令。

《柯林斯英汉双解大词典》

Many apes and monkeys carry their own strain of S.I.V, but it's not clear how long the viruses have been infecting primates.

很多猩猩和猴子都带有自己的SIV毒株，但病毒感染灵长类多久了一直不清楚。

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In the time between an appointment and clear evidence of results, your colleagues and superiors will watch and decide whether you carry influence in the organization.

从新任命的下达到最终的产生结果这段时间，你的同事与上司都在观察你，判断你是否能给企业带来影响。

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The regime also has ballistic missiles capable of reaching Japan, but it is not clear if these could carry nuclear warheads.

ECONOMIST: Dangerous and nuclear

Our hero was soon limping, it became clear he could not carry on and he was eventually replaced by Darius Vassell.

BBC: 03.10.04 BACK TO EARTH

"The government has made it clear that it intends to carry out a thorough review to reduce the risks of future disease outbreaks, " she said.

BBC: Disease source 'may not be traced'