一旦登上龙墙山的顶峰，就可以一睹月亮湖的美景。

As soon as you reach the top of Drachenwand (means dragon wall) you have great views on lake Mondsee.

youdao

如果我们人类一旦登上火星，就可能首先用钚来把火星加热到更像地球的温度，以使火星能适合人类居住。

If we mankind could ever get to Mars, we might first of all use plutonium to heat up the planet to a more earth-like temperature so as to make it suitable for humans to live on.

youdao

如果我们人类一旦登上火星，就可能首先用钚来把火星加热到更像地球的温度，以使火星能适合于人类居住。

If we humans could ever get to Wars, we might first of all use Plutonium to heat up the planet to a more earth-like temperature in order to make it suitable to humans to live on.

youdao