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to try to find out what someone thinks (about something).
试探
Sound him out gradually. Make sure it is what he really wants.
要慢慢地打探他的口风，要确保是他的心里话。
I am trying to sound out if he'd like to work for us.
我正在试探他，看他是否愿意来为我们工作。
We'll have to sound out the opposition before we decide what action to take.
在我们采取行动以前，我们得探探反对派的口气。