And they warn that serious complications may ensue.
他们警告说术后可能发生严重的并发症。
And, they warn, the holiday season may make it worse.
探员们还警告说，这种情况可能随着假日的到来而更加严重。
They warn people against destroying trees.
他们警告人们不要破坏树木。
They warn predators that these frogs are poisonous.
这种颜色可以警告猎食者：“我是有毒的！”
They warn that only tough action can save the elephants from extinction.
他们警告说，要拯救大象，只能用强硬手段。
They warn that in some countries, infection rates were falling but are now rising again.
感染率在一些国家曾一度下降，但是现在又再度上升。
They warn that in some countries, infection rates were falling but are now rising again.
感染率在一些国家曾一度下降，但是现在又再度上升。
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