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- It would be unwise to change tack now. 现在改变方针是不明智的。
- Tack the folds down before you sew them firmly into place. 先用大针脚将褶子松松地缀住，然后再将其缝纫到位。
- He tried in every way to verify this theory. 他想一切办法来验证这个理论。
- I entirely approve of that theory. 我完全赞成那种理论。
- I hammered a tack into the wall and hung a small picture from it. 我在墙上钉了一个图钉，然后在上面挂了一张小图片。
- Einstein put forward his new theory of relativity. 爱因斯坦提出了相对论的新学说。
- The speaker suddenly changed tack and left us all rather confused. 演讲人突然改变了论调，把我们都搞糊涂了。
- This concept is at the very core of her theory. 这个概念是她理论的核心。
- Einstein's theory of relativity. 爱因斯坦的相对论。
- Practical experience belies this theory. 实际经验证明这个理论是错误的。
- His brother is sharp as a tack; he got100 on every test. 他弟弟十分聪明伶俐，每次考试都得100分。
- She thinks I'm going out with Jeremy but she's completely on the wrong tack. 她认为我准备同杰里米外出，但是她的想法完全错了。
- Her theory was quoted without an acknowledgement. 她的理论被人引用而未向她致谢。
- Joe hammered a tack into the wall to hang a picture. 乔用锤子把一只大头钉敲进墙中用来挂一幅画。
- Einstein's theory marked a new epoch in physics. 爱因斯坦理论开创了物理学的新纪元。
- For several years his theory held the field. 几年来他的理论一直保持着权威地位。
- Could you elaborate on this theory? 请你阐述这一理论，行吗？
- He hammered a tack into the wall to hang a picture. 他在墙上钉一枚平头钉用来挂画。
- Do you agree to the wave theory of light? 你同意光的波动理论吗？
- We came about and went off on a new tack. 我们改变方向朝一个新的航向开去。
