不能不: have to; cannot but 短语和例子不能不谈到某些事实 cannot well remain silent about certain facts; 不能不指出 it must be pointed out that ...; 不能不表示惋惜 cannot but express regret; 我们不能不提到某些历史事实。 we cannot very we
不能不说: be [feel] impelled to speak; cannot keep silent (about ...)