他们的声音听起来很相似，我很难分辨。

Their voices sound very similar, it's hard for me to tell them apart.

听起来很难申请，祝你好运。

B: Sounds hard. Good luck.

把头发丝分开听起来很难做到。

This sounds very hard to do.

探测彗星听起来很难——毕竟，这些雪球通常只有5-20公里（3 - 13英里）直径。

Detecting cometary sound difficult -- after all, the snowballs are typically only 5-20kilometers (3-13 miles) in diameter.

有些东西发出的声音令你很难入睡，但有些东西是固定行走或敲打的，风扇有规律的转动的声音听起来很和平。

For some the sound could make sleep harder, but for others, the steady beat of the ticking, or the quiet hum of an electric motor in a fan can be very peaceful.