Use an index card as your bookmark.

用一张索引卡做书签。

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Or take out an index card.

或用一张指数卡片。

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You'll never loose an index card again!

你再也不用担心丢失那些生词卡片了！

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Slide droplets onto a sheet of rigid paper like an index card.

将液滴滑到一张较硬的纸如索引卡上。

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Slide droplets onto a sheet of rigid paper like an index card.

将液滴滑到一张较硬的纸如索引卡上。

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