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The wave continues to grow as it sweeps back and forth across the active medium.
光波在激活媒质中来回穿过时，将不断得到加强。
youdao
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Medium teaching; Establish scene; Aggressive active.
媒体教学；创设情景；积极主动。
youdao
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Medium teaching; Establish scene; Aggressive active.
媒体教学；创设情景；积极主动。
youdao