英语语法分析

When snowfalls on high mountains or in polar regions, it may become part of the glacial system.

当雪落在高山或极地地区时，它可能成为冰川系统的一部分。

Glaciers are slowly moving masses of ice that have accumulated on land in areas where more snowfalls during a year than melts.

冰川正在缓慢地移动大量的冰，这些冰是在每年降雪量大于融化量的地区，在陆地上累积起来的。

Parts of the route driven by the bus driver have been blocked by recent snowfalls, and some passengers started to gasp and exclaim.

巴士司机驾驶的路线中有部分路段被近期的降雪堵塞了，有些游客们开始紧张地喘息和惊叫。