您要查找的是不是：
- A form of frequency modulation in which the carrier frequency is shifted between a mark frequency and a space frequency in response to the impressed intelligence signal ( frequency-shift keying ). 频率调制的一种方式,其中载波频率在标志频率和场频率之间移动,以响应外加的情报(数据)信号。
- He vainly tried to mark the defacing stain out. 他试图除去有损外观的污迹，但没有成功。
- Her school work isn't quite up to the mark. 她的功课不大符合要求。
- That was just a lot of hot air what Mark said. 马克所说的不过是一大堆空话。
- War has left its mark on the country. 战争给该国留下了不可磨灭的痕迹。
- The public scandal left a black mark on his career. 这一尽人皆知的丑闻给他的事业留下了污点。
- He varied the transmission frequency. 他变换了无线电传送的频率。
- How much do you know about the works of Mark Twin. 马克。吐温写的作品你知道多少？
- Happy anniversary, Helen and Mark! 海伦、马克，祝你们结婚周年快乐！
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- Mark and Barbara are going together now. 马克与巴巴拉现在正在谈恋爱。
- Mark has lost his job and is worse off than ever. 马克的工作丢了，情况比以前更糟。
- He rubbed out the mark on his book. 他把他书上的记号擦掉了。
- Has she ever written a letter to Mark? 她曾经写信给马克吗？
- Everyone knows Tom as an easy mark. 大家都知道汤姆是个容易上当受骗的人。
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- Do you feel up to the mark this morning? 今天早上你觉得怎么样。
- He buy a block of share in mark and spencer. 他购买了“麦克斯和斯潘塞百货联销店”的大宗股份。
- He tried hard enough, but he missed the mark. 他作了很大的努力，但还是失败了。
- Mark used to be a pilot on the Mississippi River. 马克曾在密西西比河上当过领航员。
