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soft stratum
hydroel.st. 软弱层
tech. 软弱地层; 软层
soft strata
expl. 松软岩层强度低、黏结力差、易风化、一般遇水膨胀、自稳能力差的岩层
soft stratum
: 5 phrases in 3 subjects
Bridge construction1
Engineering geology1
Technology3