when something changing
当事情发生变化时
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The doctor also said that Ms Martin's mother Margaret Graham had said she had noticed something when changing Millie's nappy.
BBC: Barry McCarney
The moment that I finally realized something was fundamentally changing about how people would share and discover video online was when the Lazy Sunday SNL video exploded and took YouTube up with it.
FORBES: Why Did YouTube Succeed Where Vimeo Failed?
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