1. Over that time, it is widely believed, 99 percent of all species have come and gone, while the planet has remained.
    这期间，99%的物种生生死死，唯独地球依然存在，这一点已成共识。

2. Officials won't tell reporters the time at which the queen and president will make their trip.
    官员们不愿向记者们透露女王和总统的行程时间。

3. One pessimistic visitor shrugged and said, "I reckon it's just a matter of time before someone has a try, isn't it?"
    一名悲观的参观者耸耸肩说："我认为，有没有人胆敢试试只是个时间问题，不是吗？"

4. They aroused great interest at the time, they had important theoretical consequences, and they provided a striking demonstration of the potentialities hidden in instruments and apparatus.
    这些观察当时引起人们极大的兴趣，具有重要的理论意义，并充分显示出了仪表和仪器的潜在力量。

5. 1 ´It´s impossible----don´t waste my time.´
    1 "根本不可能，不要浪费我的时间。"

6. Let us suppose that you are preparing a meal and keeping an eye on the baby at the same time.
    假设你在做饭，同时又在照看孩子。

7. That they hardly took the time to know each other, that they overlooked serious personality conflicts in the expectation that marriage was an automatic way to make everything work out right.
    他们在婚前几乎没有化时间去了解彼此，他们忽视了严重的性格差异，指望婚姻会自然而然地解决各种问题。我们希望避免重蹈复辙。

8. Let's hope our educators answer students' cries for career education, but at the same time let's ensure that students are prepared for the day when they realize their shortsightedness.
    我们希望我们的教育工作者能满足学生对职业教育的渴求，但与此同时，我们也要确保学生能为他们认识到自己目光短浅的那一天作好准备。

9. Let me know when Mr.Gouvernail is gone; until that time I shall be at my aunt's house."
    古韦内尔走了你告诉我。他走之前我就住姑妈家。"

10. They demand sacrifice and unselfishness, a long-term investment of the parents' time and money.
    他们需要我们做出自我牺牲和无私奉献，也就是父母对子女在金钱和时间上的长期投入。