This is an old Chinese proverb said by Laozi in 2500 years ago: å›½ä¹‹åˆ©å™¨ä¸å¯ç¤ºäºº, it means "the sharp weapon (or other sharp things) can't be shown to the world". The Chinese are still following this proverb strictly, if China accomplishes some high-tech weapons, keep in secret until the last moment, or doesn't show it at all until the real war. We get used to this manner. By contrast, some countries laud their weapons even in the advanced research phase, to be honest I was shocked by their manner at the first time. This is a big cultural difference in defense domain, what do you make of it?