冷隔是什么意思
温度较底的金属液互相对接但未融合而出现的缝隙，呈不规则的线形，有穿透的和不穿透的两种，在外力作用下有发展趋势
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____Thewaterleftinthekettle,thedoctorputseveralthingsheunwrappedfromahandkerchief.
I_______thatthere_______aneveningpartyonSaturdayevening.
As____clearfromhismanners,heisateacher.
____thecenterofourplanetarysystemwasconsideredasheresybythechurchintheMiddleAges.
Howlonghaveyou____?
