| 释义 |
subsurface stratum
- 表面下的biǎo miàn xià de
subsurface
- 地层dì céng
stratum
- 阶层jiē céng
stratum; rank; section
- 社会阶层shè huì jiē céng
stratum
- 井下安全阀jǐng xià ān quán fá
subsurface safety valve; DHSV(downhole safety valve)
- 等级děng jí
grade; rank; order and degree; social estate; social stratum
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