虽然这不是一个先决条件，但大部分成熟的水手都从小开始航海或者跟随家人一起经常体验乘船旅行。
Although it is not a precondition, most mature sailors begin sailing since young or they were exposed with regular boat trips with the family.
该公司还将出售在北海和尼日利亚的部分成熟油气田。
It is also selling some mature oil and gas fields in the North Sea and Nigeria.
介绍了在单针床经编机和双针床经编机上的不同绒类织物，及在实际中的应用，并且给出了部分成熟工艺。
This paper introduces the different pile warp knitted fabrics knitted on single and double needle bar warp knitting machines and its application in practice, and gives some mature technology.
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