In a wetland or in dense growth, you are very hard to spot.

在湿地或是灌木丛生的树林里，你很难被发现。

This very famous blooper is one that simply cannot be unseen.

这一处非常有名的穿帮实在是很难被忽略。

It'll be hard for the bully to get to you if you're with your wingmen.

如果你和你的伙伴们在一起，你就很难被欺负了。

Another unusual thing about Dorian is that it's been hard to track.

Dorian的另一个不同寻常之处在于，它很难被追踪。

Some have been associated with being a little bit harder to detect by antibodies.

有些突会更难被抗体检测出。

Why on average are these swings hard to notice in the dairy aisle?

为什么平，这些波动在乳制品货架上很难被注意到？

It takes a long time, and that is not always easy to accept.

这需要很长的时间，这通常是很难被接受的。

Full-blown climate deniers, on the other hand, are much harder to persuade.

另一方面，完全否认气候化的人则很难被服。

The dark-colored road surface makes the youngsters hard to be noticed.

深色的路面使得幼鸟们很难被注意到。

A contestant in an isolation booth was asked increasingly difficult questions.

一个在隔离隔间的选手被问到越越难的问题。

Black holes are hard to observe due to their nature.

黑洞的性质使其很难被观测到。

It employs a steel design that makes it hard to mark with paint.

它采用使其很难被涂鸦的钢结构设计。

Second, HbH has very high affinity for oxygen, and doesn't release oxygen to the tissues.

其次，HbH对氧的亲和力很高，氧很难被释放给组织利用。

So we wanted to do a subtle manipulation, a very consciously undetectable manipulation.

我们想做一种微妙的操纵，一种非常难被察觉的操纵。

Ears are mostly cartilage, which means they're very difficult to repair once damaged.

耳朵基本都是软骨构成的，也就是一旦被毁坏就很难修复。

Their design took tremendous ingenuity, making them deadly to attackers and immensely difficult to take.

它们的设计极具智慧，对进攻者很要命，也很难被攻克。

The chemicals are hard to detect in low concentrations.

这些化学品在低浓度时很难被检测出。

This all makes it harder to restore the area after it's been disrupted.

这一切都使得该地区在被破坏后更难恢复。

Anything earlier than that, though, was tough to discern.

而早于此前的残骸则很难被识别。

They're here more often than we think, but however, they are probably hard to come across.

它们出现的频率比我们想象的要高，但是，却很难被人发现。