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- This paper derives the ray matrix of the self-focusing lens from an element lens, and givesthe new relationship between object and its image. 本文从微分透镜出发．导出自聚焦透镜的光线矩阵，给出新的物象关系式．并进一步讨论自聚焦透镜成象的有关问题。
- The interaction of these seven elements is what determines the outcome in any instance of speech communication. 这七个要素的相互作用决定任何情况下演说交流的效果。
- Three sticks and seven elements of body and functions of viscera are suited with the regular of natural movement,and is a same steps movement. 人体三根七素以及脏腑功能与自然界的运动规律相适应,与自然界同步运转。
- Lockup regularly occurs at seven o'clock. 夜间关门时间通常是在七点钟。
- She has as many as seven sisters. 她的姊妹有七人之多。
- She won two third places in the seven events. 她在七项比赛中得了两个第三名。
- In a printer, the removable type element. 印刷机上可拆卸的打印部件。
- There are seven continents in the world. 世界上有七大洲。
- The baby weighed seven pounds at birth. 那婴儿出生时重七磅。
- The dinner consists of seven courses. 晚饭有七道菜。
- He's in his element when playing badminton. 他打起羽毛球来真是得心应手。
- This heater needs a new element. 这个加热器需要一组新电阻丝。
- Four multiplied by seven is twenty-eight. 7乘4等于28。
- He had to support his seven children, to say nothing of his wife and parents. 他要养活自己的七个孩子，更不必说还有妻子和父母了。
- I'm out of my element in political discussions. 我不喜欢参加政治讨论。
- Maintenance of PC is in my element. 我对电脑的维修保养很在行。
- I used to have breakfast at seven. 我总是7点吃早餐。
- A metrical unit consisting of seven feet. 七韵步由七个音步组成的格律单位
- Sulphur was not identified as an element until1810. 1810年以前还没有认出硫是一种元素。
- He was composing at the piano at the age of seven. 他7岁时就会钢琴作曲。
