The unallowable wellbore enlargement rate (20%-30%) is the severest problem of wellbore qualities in the job area of north of Hubei.

井径扩大率超标是区井身质量存在最大问题,一般都达到20％～30％,严重影响成井质量。

Unlike their more massive counterparts, sunlike stars are thought to die gracefully by ejecting their outer gaseous layers in a nonexplosive process that takes about 10,000 years.

不大质量恒星，同太阳一般大小恒星，死状就相对优雅得多。它爆发性过程大约需要一万年时间，逐步弹射出其外部气体壳层。