t-13:talk off(of) the top of one's head 信口雌黄
a:i heard that rose would be your headmaster.
a:我听说罗丝要当你们的校长了。
b:who told you that?
b：谁告诉你的？
a:it's bob.
a:鲍勃说的。
b:bob? he always talks off the top of his head.
b：鲍勃？他总是信口雌黄。
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