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...
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...