Zaitsev
n. (Zaitsev)人名；(俄)扎伊采夫
🗣️ 情景例句
(looking at his calendar) Oh, next Friday is May 4th.
（正在看着日历）哦，下周五是五月四号了。
Have you taken a bus?
你坐过汽车吗？
Even more processes are never patented at all but kept as secret processes.
更多的工艺过程根本就不会取得专利权，而是作为秘方保存着。