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

径扩大率超标是鄂北工区身存在最大问题,一般都达到20％～30％,严重影响成。

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.

不大恒星，同太阳一般大小恒星，死状就相对优雅得多。它们非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。