句子翻译。将下列句子译成英语。

尽管山很高，但我相信我最终一定能到达山顶。

,though it is very high．

句子翻译。将下列句子译成英语。

现在很多人喜欢乘坐高铁(high-speed train)，因为它更快。

句子翻译。将下列句子译成英语。

我们的教室一天打扫两次。

句子翻译。将下列句子译成英语。

杰克不在家，他在图书馆看书。

Jack isn't at home．

句子翻译。将下列句子译成英语。

大连有多少人口？

When someone smokes, they hurt not only themselves, but also the people around them．Second-hand smoke greatly increases many dangers, such as respiratory disease(呼吸疾病), cancer and heart disease．

Smoking is bad for your health．However, there are still about 2 billion people smoking all around the world, according to the World Health Organization．