参见：未曾[wèicéng]
这事他未尝知道。
He doesn't know this yet.
终夜未尝合眼
not get a wink of sleep the whole night
不，没有not necessarily
未尝不可
not necessarily impossible
未尝不是这样。
Perhaps it is like this.
未尝没有根据
not necessarily baseless
这未尝不是一条出路。
This could be a way out.
但也未尝没有缺点。
But there are also some shortcomings.
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