HSK 7-9
连锁
liánsuǒ形
to interlock; to be linked; chain (store etc)
事故引发了一系列连锁反应。
Shìgù yǐnfā le yí xìliè liánsuǒ fǎnyìng.
The accident triggered a chain of reactions.
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Appears across levels (7-9) in the HSK 3.0 word list.