1·When the rainstorm came, it began to rain hard and the wind blew strongly.
暴风雨来临时，开始下大雨，刮大风。
2·It began to rain hard.
开始下大雨了。
3·It began to rain hard.
的翻译是：它就开始下雨。
4·I'll be back tomorrow if it doesn't rain hard.
如果天不下大雨的话，我明天就回来。
5·I was just about to go out, when it began to rain hard.
我正要出门的时候，天空开始下起了大雨。
6·It is rain hard, but we get there in time all the same.
那时正下着雨，我们还是准时到达那里。
7·Decade rain hard struggle, Cathay strength to create value.
十年风雨艰辛拼搏，国泰实力创造价值。
8·No matter how hard the rain falls and the wind blows, the police keep to their posts.
无论风多大、雨多急，警察一直坚守在岗位上。
9·High pressure makes it hard for clouds to form, and thus for rain to fall.
高压很难形成云，提供降雨。
10·This cooling liquid formed a very hard rock known as granite. Many centuries of rain caused huge rivers to move violently through this area.
长期的雨水形成了巨大的河流，猛烈地冲刷这一地区。