词汇	well pulling ground
释义	well pulling ground 易于掘进的岩层
随便看	pre-productioned missile preproduction engine pre-production expenditure pre-production expenditures pre-production finishing preproduction helicopter preproduction inspection pre-production meeting pre-production missile preproduction model pre-production model Pre-Production Operational Test preproduction planning pre-production planning preproduction prototype Pre-Production Proveout Test Preproduction Qualification Test Preproduction Reliability Design Review preproductions pre-productions preproduction sample pre-production service pre-production stage preproduction test pre-production test