The boat is drifting downstream．

The city is surrounded on all sides by hills．

The countryside there is flat as a pancake．

The Great Wall winds its way from west to east, across deserts, over mountains, through valleys until at last it reaches the sea．

The naughty boy was walking slowly up a steep slope．

We could see a boat about a mile from the shore．

The peak is covered with snow all the year round．

翻译下面句子

我们需要改善产品的质量，而不是增加产品的数量。

翻译下面句子

这位老人以种花、卖花维持生计。

翻译下面句子

在过去的二十年里，科学家们在太空旅游方面取得了许多突破。