His firm is just on thin ice of bankruptcy.他的商号正面临破产的危险.It is dangerous to walk on thin ice in a lake.在湖中薄冰上行走是很危险的.I had skated on thin ice and, so far, got away with it.我曾经冒过很大风险，但目前为止侥幸没事。...
The main controlling factors of reservoir developing are lithology , lithofacies and ancient weathering crust karstification.储层发育的主要控制因素为岩性和岩相、古风化壳岩溶作用.The metallocene is summarized as strata, lithology, structure, and e...