智能手机的出现是科技发展的一个分水岭。
The advent of smartphones was a ___watershed in technological development.
这条山脉是两个主要河流流域的分水岭。
The mountain range serves as the ___watershed between two major river basins.
这项新技术的出现成为整个行业的转折点。
The emergence of this new technology became a ___watershed for the entire industry.
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