防晒霜应每隔一小时再抹一次。Sunblock should be reapplied every hour.不论何时只要有一点可能暴露在阳光下，我就会用防晒霜。I use a sunscreen whenever there is even a remote possibility that I will be in the sun.即使黑皮肤的女性也应该涂抹防晒霜。Even dark-skinned women should use ...
The troops were severely mauled and lost a quarter of their strength before evacuating the island.部队遭到重创，从岛上撤退前损失了四分之一的兵力。The solution is degassed by alternately freezing, evacuating and thawing.通过交替的冻结 、 抽空和溶化来使溶液除气.Fir...
只有精密的X射线仪器才能显示出来。It will only register on sophisticated X-ray equipment.射线对于果蝇的遗传产生强烈的作用.Radiation has a strong effect on the heredity of fruit flies.外科医生用X射线照射那个肿瘤.The surgeons irradiated the tumour....
Old people often try to economize on heating, thus endangering their health.老年人常常想方设法节约用暖气，结果损害了他们的健康。They are charged breaking regulations and endangering the public safety.他们被控告违章驾驶危及公众安全.The fire spread endangering se...