If a flush ever happened during the rendering of different views, there would be no chance to accomplish the deferred flush at the end of the flow.

如果在呈现不同视图期间发生过刷新，那么就无法在流末尾完成延迟的刷新。

youdao

According to the Associated Press, the synchronised flush will now take place at the same time twice a week - on Mondays and Thursdays - though residents will of course be able to flush their toilets at other times too.

BBC: Synchronised toilet flush held in Zimbabwe's Bulawayo

The first synchronised flush took place at 19:30 local time (17:30 GMT).

BBC: Synchronised toilet flush held in Zimbabwe's Bulawayo

Coat hangers were not invented until 1900, but flush loos were seen at the Great Exhibition of 1851.

ECONOMIST: 19th-century domesticity