when relaxes
当放松
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The heart muscle contracts and relaxes when calcium is released from a reservoir inside into the muscle cell and then pumped back quickly.
BBC: Gene link to inherited heart disease
Let's see what happens when Europe finally relaxes monetary policy.
FORBES: Magazine Article
When injected in diluted form, Botox relaxes muscle movements that cause twitches and stuttering as well as those distressing wrinkles.
ECONOMIST: Beauty treatments
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