Spadaite
红硅镁石
🗣️ 情景例句
How do you keep in shape?
你怎么保持身材？
In case of fire, keep your head.
万一发生火灾，保持镇定。
Yet a great many processes depending on such research are sought for with complete secrecy until the stage at which patents can be taken out.
然而，依赖这种研究的很多工艺程序是在完全保密的情况下进行的，直到可以取得专利权的阶段为止。