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

井径扩大率超标是鄂北工区井身质量存在的最大问题,一般都达到20％～30％,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.

不大质量的恒星，一般大小的恒星，死状就相对优雅得多。它们的非爆发性过程大约需要一万年的时间，逐步弹射出其外部气体壳层。