标题：Zheng Qinwen’s Olympic gold: A watershed moment for tennis and China

正文：It was only a matter of time for Chinese tennis, wasn’t it? In the biggest win on a tennis court for the world’s most populous country since the glory days of Li Na, Zheng Qinwen won the gold medal for China at Roland Garros on Saturday afternoon. Zheng, a 21-year-old rising star, took advantage of an erratic performance from Donna Vekic of Croatia to give China its first Olympic medal in singles, on the same court that Li notched her breakthrough win at the French Open, 13 years ago.

知识点：watershed n.

1. (in sth)an event or a period of time that marks an important change转折点，分界线，分水岭（标志着重大变化的事件或时期）

The middle decades of the 19th century marked a watershed in Russia's history.19世纪中叶标志着俄国历史的转折点。

2. a line of high land where streams on one side flow into one river, and streams on the other side flow into a different river

分水线；分水岭；分水界

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