大惑不解: be not a little bewildered; be greatly [utterly; extremely] puzzled; be in a puzzle (about ...); be unable to make head or tail of sth.; be at a loss
缄默: keep silent; be reticent 短语和例子保持缄默 remain silent; 官员们对于会谈情况保持缄默。 the officials maintained a wall of silence around the talks. 我们不应对这件可耻的事保持缄默。 we should not pass over this disgraceful affa