1. All the actors know the play backward.
   所有演员对剧本都熟知到可以倒背如流。
2. The country is still in a backward state.
   那个国家仍然处于落后状态。
3. The child was backward in learning to walk.
   那孩子学步较晚。
4. He stepped backward and fell over the cliff.
   他向后退了一步就从悬崖上掉下去了。
5. The crops are backward this year.
   今年的收获期较往年晚。
6. He did a brilliant backward somersault.
   他翻了个漂亮的后翻跟头。
7. The United Nations appealed to the people of the developed countries for aiding those of the backward countries.
   联合国呼吁发达国家的人民援助落后国家的人民。
8. Erbium-doped superfluorescent fiber sources (SFS) pumped near 980nm in double-pass backward (DPB) configuration have been characterized through theoretical simulation.
   理论研究了双程后向结构掺铒光纤超荧光光源的特性。
9. Erbium ions concentration is obtained by the information of measured coefficients along with modeling of double-pass backward (DPB) superfluorescent fiber source (SFS).
   再利用这些系数和复行后向超萤光光纤光源的模拟，得到掺铒光纤的浓度。
10. Then a new algorithm of brivate vector -valued rational interpolants by means of complexification of the knots and backward three-term recurrence relations is given.
    然后利用插值型值点复数化的方法及向量值连分式的向后三项递推关系式讨论并给出了二元向量值有理插值的一种新算法。
11. The system uses PLC procedure control, start-up, forward or backward soldering gun, arc starting, workpiece circumgyration, etc full welding process all can complete automatically.
    系统采用PLC程序控制，启动、进退枪、引弧、工件旋转等焊接全过程均能自动完成。
12. Through the window, we can see Michael is standing and talking to a manager like person who is sitting in the chair leaning backward superciliously.
    （从窗户往里看，我们看到迈克尔站着，跟一个经历模样的人说话，那个人斜靠在椅子上，很傲慢的样子。
13. The so-called hypernormal development means the regional economy can be developed with the growth rate of more than two-figure number, and realize the newcoming advantage of the backward areas.
    摘要所谓超常规发展，就是指区域经济能够以两位数以上的增长速度发展，实现落后地位的后发优势。

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