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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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ない， 無い

1. nonexistent, not being (there) 2. unowned, not had, unpossessed 3. unique 4. not, impossible, won't happen 5. not 6. to not be, to have not

tbd

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题

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