seeing /ˈsiːjɪŋ/ conjunction Learner's definition of SEEING
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used to explain the reason for a statement鉴于，因为（用于解释原因） —
often + that or as -
There's not much we can do, seeing that [=since] they've already made their decision.我们能做的好像不多，因为他们已经做出了决定。
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Seeing as you've met my family, don't you think I should meet yours?既然你都见过我的家人了，你不觉得我该见见你的家人吗？
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Seeing as how [=since] I'm not busy right now, I can help you.我现在不忙，可以帮你一把。