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来源:雅诚德英语网
You can imagine a bead with a wire going through it and the bead can only slide back and forth.
你可以想象一个有金属丝穿过的珠子而且这个珠子只能前后滑动。
You can imagine a bead with a wire going through it and the bead can only slide back and forth.
你可以想象一个有金属丝穿过的珠子而且这个珠子只能前后滑动。