Their argument ended when she slammed the door and left without a word.
The guests at the dinner party were slightly surprised at the commanding tone of the American.
Johnny has outgrown the fear of staying at home alone.
Apparently, finding alternative energy sources is essential to the steady development of our economy.
4) 太阳能电池（solar cell）能吸收阳光并把它变成电。
Solar cells can absorb sunlight and convert it into electricity.
If the temperature on the Earth continues to go up from year to year, the polar ice caps will begin to melt and, in all likelihood, half of the buildings in coastal cities will disappear beneath splashing sea waves.
6) 因为这些生物很小并且常常躲在叶子茂密的植物下面，肉眼并不都可以看见。Because these creatures are small and tend to hide beneath leafy plants, they are not always visible to the naked eye.
As a result of exposure to atomic radiation, he finally collapsed at work.
Book2 Unit8 翻译
Book2 Unit10 翻译
Through the article the author wants to convey to the readers her views on praise and criticism.
As parents we should know that for children an ounce of praise is worth a pound of scolding.
3) 这位教师并不是一个了不起的学者，但他的确懂得怎样把一门课教得活泼而有趣。(in a ... manner)
The teacher isn't much of a scholar, but he does know how to teach a course in a lively and interesting manner.
We often find it much more difficult to apply a rule than to know it.
5) 她从不因为孩子们争吵而责骂他们，而是在他们安安静静地玩耍时赞扬几句。She never scolds her children for squabbling. Instead, she gives them a few words of praise when they play quietly.