Perching
[机] 挟刮法
🗣️ 情景例句
Happy birthday, Carl.
生日快乐 ，Carl。
In the United States ,there are many factories for making cloth.
在美国，有许多造布的工厂 。
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。