鲑鱼在海中生活数年之后，在夏季洄游到它们的出生地，产卵然后死亡。在这一路上它们几乎不吃东西。
After being at sea for several years, salmon return in summer to the sites of their birth to spawn and die, and hardly feed along their final journey.
炎热的夏季里，被父母锁在密封的汽车里而导致窒息死亡的案例有很多。
There have been many cases where children have died when their parents left them in locked cars on b hot summer day.
像2003年发生在欧洲导致3万人死亡的夏季热浪将演变成年度事件。
Summer heatwaves such as that in Europe in 2003, which killed 30, 000 people, become annual events.
2003年袭击意大利和欧洲各地创纪录的夏季高温导致数万人死亡，这使拉格德更加震惊。
The record summer heat that struck Italy and the rest of Europe in 2003, killing tens of thousands, made Lageder even more alarmed.
这些创伤性弧菌在夏季繁殖，极具致命性，每年都有一半左右的感染者死亡。
These "flesh-eating" bacteria proliferate in warm months and are especially deadly; they kill half of the thirty or so people who develop infections from it each year.
结果大气污染在冬季对居民呼吸系统疾病造成的死亡影响高于夏季。
Results There was a stronger association between air pollution and respiratory daily mortality in the winter than in the summer.
结果大气污染在冬季对居民呼吸系统疾病造成的死亡影响高于夏季。
Results There was a stronger association between air pollution and respiratory daily mortality in the winter than in the summer.
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