Tcnb
[建] 四氧硝基苯
🗣️ 情景例句
A critic was there this morning.
一个评论家早上去过了。
Little wealth, little care.
财少寡忧。
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。