Thermit welding and elastic fastening device can reduce the number of joints, overcome the thermal expansion and cold shrinkage of rails, and make the operation of traveling crane smooth and steady.

采用钢轨弹力紧固装置和钢轨铝热焊技术，减少钢轨接头，克服钢轨热胀冷缩带来的弊端，使得行车在钢轨上运行平稳可靠。

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From 1983 to the present as you just said, the economy has a long period of smooth, robust expansion interrupted by two very mild recessions.

第二时期是从1983年至今，正如你所说，经济长时间处于,平稳强健的发展状态,而只出现了两次轻度衰退。

斯坦福公开课 - 经济学课程节选

But the company has faced a barrage of unfavorable publicity in recent months, including the fallout from allegations that it bribed officials in Mexico in order to smooth the way for store expansion, and criticism about its global sourcing practices after its clothing was found in a Bangladesh factory where more than 100 workers died in a fire last year.

WSJ: Wal-Mart Ad Campaign Touts 'American Success Story'

Such expansion would stretch space and smooth matter, while leaving small density variations that show up in the CMB.

BBC: The observable Universe and beyond