His smile had no heart in it, but few eyes were near enough or sharp enough to detect that.

他的笑容里没有一丝一毫的感情，但很少有眼睛能近距离或敏锐地察觉到这一点。

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Experts stressed that the ash, in tiny particles and difficult to detect, was no danger to public health but posed a distinct danger to aircraft.

专家们强调，微小颗粒的灰尘不易察觉，是不会危害公众健康危险，但是极易对飞机构成威胁。

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To my knowledge, no perfect way to detect JIT compilation exists.

根据我的知识，还没有探测 JIT 编译是否发生的完美方法。

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What else can you detect as a yes or no answer is the mouse down?

当鼠标点下时，除了检查真假还能检测什么？

哈佛公开课 - 计算机科学课程节选

One can detect no indications in Soviet stores that military production has actually been diverted.

CENTERFORSECURITYPOLICY: US-Soviet Relations

But there's no scan to detect these tangles in a living patient.

CNN: Alzheimer's: Early detection, risk factors are crucial

Sensors automatically turn off lights after five minutes if they detect no movement and adjust the light level according to the available daylight.

CNN: Catalog company going lean and green