Western countries have evry strict visa requirements.
在西方国家有严格的签证要求。
The unrighteous penny corrupts the righteous pound.
不正当得来的便士会使正当得来的英镑受到污浊。
In this part of the cave, they could hear an insistent booming sound which they found was caused by a small waterspout shooting down into a pool from the roof of the cave.