您要查找的是不是：
- It is not certain how the earth began. 地球是怎样起源的还没有定论。
- It is not certain when it will take place. 不能确定这事什么时候会发生。
- It is not certain; it is just conjecture. 事情尚未确定，只不过是个猜测而己。
- Nesta could rest, but it is not certain. 内斯塔将会休息，但是这还不确定。
- I am not certain whether it is true or not. 我没有把握这是否如此。
- I'm not certain whether it is true or not. 我没有把握这是否如此。
- It is not easy to get a foothold as an anchorman. 一个电视节目主持人要站住脚可不容易。
- It is not always reliable to argue by analogy. 用类推法论证并不总是可靠的。
- It is not easy to make a simile go on all fours. 一个比喻要完全贴切是不容易的。
- It is not easy to dig out the past. 发掘过去的历史是不容易的。
- It is not price but quality that sells our shoes. 我们的鞋好卖不是因为价钱低而是因为质量好。
- By cock and pie it is not worth a penny. 说句天地良心话，那根本一文不值。
- It is not right to harbor vindictive feelings. 怀有报复的念头是不对的。
- It is not easy to distinguish between twins. 区别双胞胎并不容易。
- It is not easy to educate teenagers. 教育青少年不是件容易的事。
- It is not easy to true up a frame. 做个标准的框架也不容易。
- It is not for the love of gain that he does so. 他这样做并非为了得什么好处。
- It is not good to trade on another's ignorance. 利用他人的无知是不应该的。
- It is not as (so) popular as other foods. 它不像其他食物那样受欢迎。
- It is not uncommon for women to smoke in public. 妇女在大众面前抽烟并非不常见。
