An estimated 70% of California's citrus crops have been damaged by a severe cold snap that is bringing icy temperatures to California's central valley.

这次寒冷的天气袭击加州中部峡谷地区后，预计加州70%的柑橘都被寒冷的天气冻伤了。

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When his family was poor, small, no money to buy books, only to find books borrowed a copy of the home, regardless of severe cold and heat, have no nose to the grindstone.

在他小的时候家境穷苦，没钱买书，只能找藏书之家借来抄，无论严寒酷暑，都丝毫不敢懈怠。

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Older children and adults who have whooping cough often appear to have a bad cold or persistent cough that can be so severe that it causes vomiting.

CNN: Can breast-feeding prevent whooping cough?