摸底细: feel out; sound out; try to find out the real intention or situation
试探: sound out; feel out; probe; explore 短语和例子试探他们的意图 sound out their intention; 试探反应 fly one's kite; 我根本不把他说的当回事, 他只是试探试探罢了。 i wouldn't take what he said seriously, he was only flying a kite