Suppose someone gave you a pen-a sealed, solid-colored pen.
假设有人给了你一支笔，一支密封的、纯色的水笔。
Suppose someone gave you a pen - a sealed, solid-colored pen. You couldn't see how much ink it had.
假设有人给了你一枝笔，一枝密封的、纯色的水笔，里面有多少墨水你看不到。
Suppose someone gave you a pen - a sealed, solid-colored pen. You couldn't see how much ink it had.
假设有人给了你一枝笔，一枝密封的、纯色的水笔，里面有多少墨水你看不到。
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