Too much time spent in icy water can cause hypothermia.
Mandarin
例如在抗战初起时，许多人有一种毫无根据的乐观倾向，他们把日本估计过低，甚至以为日本不能打到山西。
例如在抗戰初起時，許多人有一種毫無根據的樂觀傾向，他們把日本估計過低，甚至以為日本不能打到山西。
lì rú zài kàng zhàn chū qǐ shí ， xǔ duō rén yǒu yī zhǒng háo wú gēn jù de lè guān qīng xiàng ， tā men bǎ rì běn gū jì guò dī ， shèn zhì yǐ wéi rì běn bù néng dǎ dào shān xī ．
For instance, at the outset of the war many people were groundlessly optimistic, underestimating Japan and even believing that the Japanese could not get as far as Shanxi.