Yet, imperceptible to the human eye.

然而肉眼却无法看见。

However, the cold weather seems to be imperceptible to winter swimming enthusiasts.

然而寒冷天气并没有冷却冬泳爱好者们热情。

An almost imperceptible raise of the hand indicates a bid.

一个几乎觉察不到举手则表示叫牌。

Or is it his almost imperceptible limp from last year's water crossing?

还是去年过河时几乎察觉不到跛行？

The idea is that it's sort of imperceptible which one it is.

这个想法是，有点难以察觉该是哪一个定位。

His hearing is better than ours too, tuned to sounds that are completely imperceptible to the human ear.

力也比我们强，能到人耳完全不到声音。

I bowed to him. He gave me an almost imperceptible bow in return, without saying a word to me.

我向行个礼。回答我一个礼，这是一种差不多看不出来礼，一句话也没有说。

It responded to an almost imperceptible touch on it.

几乎难以察觉触碰做出了反应。

Their intimacy increased by regular and almost imperceptible degrees.

们亲密程度有规律地增加， 几乎难以察觉。

The instances of a word shade off into other movements by imperceptible degrees.

一个词实例以难以察觉程度逐渐融入其动作。

This would make his movements so impossibly slow that they would be all but imperceptible to the enemy.

这将使动作慢得不可思议，以至于敌人几乎察觉不到。

There was a small, almost imperceptible, change in the mirror's reflection just before the rose appeared.

就在玫瑰出现之前，镜子反射发生了微小、几乎难以察觉变化。

Yet, this genetic material may be present in such imperceptible amounts that actually detecting it is difficult.

然而，这种遗传物质可能以难以察觉数量存在，以至于很难真正检测到。

Then it begins to slow anew, and by the June solstice, its motion becomes nigh imperceptible once again.

然后开始再次减速，到六月至日，运动再次变得几乎难以察觉。

The story is about a little dog who hears a tiny, almost imperceptible noise and tries to identify it.

这个故事是关于一只小狗到了一个微小到几乎难以察觉声音， 并试图去辨认出。

The end part of the wing, just  beyond the outboard engine pylon, has an almost imperceptible twist  to it.

机翼末端，就在舷外发动机挂架之外，有一个几乎察觉不到扭曲。

Don't you admire those blending hues of lava, passing from reddish brown to bright yellow by imperceptible shades?

难道你不欣赏熔岩这些混合色调吗？们从红棕色到亮黄色， 以难以察觉色调转变？

But inexorably, every thirty seconds, the minute hand of the electric clock above his bed jumped forward with an almost imperceptible click.

但无可改变是，床头电钟分外每三十秒就要发出几乎不见一声“嗒”，跳前一步。

Studies show the use of antiretroviral drugs dramatically reduces the risk of HIV transmission by lowering the amount of virus to near imperceptible levels.

研究表明使用抗逆转录药物能将病毒量降低到几乎无法觉察水平，从而极大地降低艾滋病毒传播风险。

Now the distances that light travels on Earth are relatively short, so the time it takes light to travel to our eye is imperceptible.

在地球上光传播距离非常短，我们眼中世界基本上没有什么延迟。