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無駄にする， むだにする

1. to render futile, to bring to naught, to waste, to not make good use of

tbd

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時間， じかん

1. time 2. hour 3. period, class, lesson

时间的单位：小时；小时；时间，时刻

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を

1. indicates direct object of action 2. indicates subject of causative expression 3. indicates an area traversed 4. indicates time (period) over which action takes place 5. indicates point of departure or separation of action 6. indicates object of d...

表示动作的直接对象；表示经过的场所；表示离开或分开的点

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取り戻す， とりもどす

1. to take back, to get back, to regain, to recover, to restore, to recoup

收回，取回，重新获得，恢复，重建，挽回

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さえすれば

1. you have only to, all you have to (do), all that's required, as long as, if only

你只需，所有你所要(做的)，所需的一切，只要

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