It is called passive sniffing because it is difficult to detect.
和生命所需的其他营养物质不同,磷很难被发现。
Unlike other essential nutrients for life, phosphorous is hard to find.
这种体型使它们很难被发现。
This nature makes them hard to be found.
乳腺癌在其早期阶段往往很难被发现。
Breast cancer can often be difficult to detect in its early stages.
它们很难被发现,尤其是当你身在其中时。
It's difficult to see, especially when you're part of it yourself.
这就增加了很难被发现的问题。
This causes problems that are very difficult to find.
这使得它们很难被发现,即使是经验丰富的松鼠搜寻者。
This makes them difficult to see, even for seasoned squirrel seekers.
这个地方很难被发现,除非你是该镇的居民。
This one is hard to detect unless you're trained in this area.
这些手段是隐藏的,很难被发现。
These holes are hidden and are difficult to find out.
机器人可以模拟真实的人类行为,所以很难被发现。
Bots can mimic human behaviour, so they are difficult to detect.
从潜水艇发射导弹很难被发现。
Weapons launched from submarines are very difficult to detect.
这使得它们有时很难被发现。
This made them sometimes hard to find.
那么为什么那里的生命可能很难被发现??
So why might it be hard to find?
在大多数情况下,第一周的妊娠很难被发现。
Pregnancy in 1st Week in most of the cases are very hard to detect.
它被称为被动嗅探,因为它很难被发现。
It's called a silent killer because it's hard to detect.
当然,这些黑洞会非常小,而且很难被发现。
Of course,these black holes would be quite tiny, and difficult to detect.
固然,这些黑洞会非常小,而且很难被发现。
Of course,these black holes would be quite tiny, and difficult to detect.
同时它们生长缓慢,很难被发现。
They also grow very slowly, so they are hard to detect.
CKDu部分是致命的,因为它很难被发现。
CKDu is so fatal in part because it is hard to detect.
白内障在其发育的早期阶段很难被发现。
Cataracts are very difficult to detect at the early stages of their development.
它很容易移动,而且最初很难被发现。
It moves real easily and it's hard to detect initially….
这样的情节很难被发现,因为它们不需要大量阴谋的人可以拦截其电子邮件或电话。
Such plots are difficult to detect as a result of they don't require massive conspiracies of individuals whose emails or cellphone calls can be intercepted.
它们很难被发现,很难被看见,因此很难被击中。
They're hard to find, they're hard to see, therefore they're hard to beat.
孤儿行星很难被发现是因为它们不环绕恒星旋转,反射光线非常少。
The planets are hard to find because, without orbiting a star, they reflect very little light.
这样的情节很难被发现,因为它们不需要大量阴谋的人可以拦截其电子邮件或电话。
Such plots are difficult to detect because they don't require large conspiracies of people whose emails or phone calls can be intercepted.
然而这些解释很难被发现,因为很少有关于零工经济规模的高质量数据。
These explanations, however, were hard to spot because there was so little quality data about the gig economy's size.
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