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1.Most people who want to get ahead spend useful time writing personal notes of gratitude，sympathy and congratulations.
大多数想获得成功的人都利用有用的时间来写表示感谢、慰问和祝贺的私人信函。收藏指正
2.It can extend the useful time of the lye inside the bottlewasher 1-3 times and even more after using the lye recycling purifier.
使用碱液回收过滤机后能够延长洗瓶机碱液使用时间1倍—3倍，甚至更多。收藏指正
3.At S-band useful delay time controlled magnetically ranges from 0 to 1μs. The untuned insertion loss at 2GHz and 4GHz is less than 26dB when delay time is about 1μs.
在2、4GHz的工作频率下,延迟1μs时的未调谐插入损耗小于26dB。收藏指正
4.A little money can be a useful buffer in time of need.
在急需时, 很少一点钱就能解燃眉之急。收藏指正
5.A little money can be a useful buffer in time of need.
为数不多的钱在需要的时候能做有用的缓冲。收藏指正
6.This technology is very useful for decreasing the time of hydrogenation catalyst presulfurization and the equipment eroding as well as pollution.
该工艺对缩短加氢催化剂的预硫化时间，减少调备腐蚀和环境污染，具有非常积极的意义。收藏指正
7.These results are useful for the investigation for the extinction time of branching processes in random environmet.
这此结果对研究随机环境中分枝链的灭绝时是有帮助的。收藏指正
8.But as for the non-stationary signal, this tool is not useful because it is a fully time domain or fully frequency domain transform, it cannot provide the frequency information at any local time segment.
但对非平稳信号来说，这种工具就显得力不从心。 因为它是一种全频域、全时域的变换，它将信号从时域变换到了频域，在频域的定位性是完全准确的(即频域分辨率最高)，但其在时域却无任何分辨能力，不能提供任何局部时间段上的频率信息。收藏指正
9.that such children serve no useful purpose; and that a pregnancy is so much time wasted.
再说，这样的孩子还是没有的好，而且大着肚子不做买卖也是浪费时间。收藏指正
10.These trees need more time to grow into useful timber.
这些树不够年头， 还没成材呢。收藏指正
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