英语语法分析

Today, only three countries have finished spacewalks independently.

今天，只有三个国家独立完成了太空行走。

Astronauts practice spacewalks underwater in a huge special swimming pool.

宇航员在一个巨大的、特别的游泳池里进行水下太空行走的练习。

The world record of spacewalks is held by Russian astronaut Anatoly Solovyev.

太空行走的世界纪录由俄罗斯宇航员阿纳托利·索洛维耶夫保持。