to say "I don't know"...

作為一個professional,可能對client說我不知道是一件非常沒有麵子的事,但是我相信一個從沒有對自己client說過 "I don't know." 的professional絕對不是一個好的professional.

also, the ability to admit you do not know something is a sign of self-confidence.

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