Pin-Up Girl: Could I have one?
戴面具的女孩：我可以试试吗？
The teachers usually pin up the best work on the board.
老师们通常把最好的作业钉在展示板上。
The teachers usually pin up the best work on the board.
老师通常把最好的作业钉在展示板上。
But it took up to now to witness the process in action and pin down the mechanism.
但直到今天才能亲眼目击这一过程并阐明它的机制。
But it took up to now to witness the process in action and pin down the mechanism.
但直到今天才能亲眼目击这一过程并阐明它的机制。
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