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Use simple tools such as index CARDS and whiteboards.
用简单工具，譬如索引卡和白板。
youdao
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The process to replace all blackboards with electronic whiteboards can be arduous.
用电子白板取代所有的黑板会是非常困难的。
youdao
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The process to replace all blackboards with electronic whiteboards can be arduous.
用电子白板取代所有的黑板会是非常困难的。
youdao