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shelf life
They offer 70 hours' standby time, 2hr. 50min. talk time, and 15 ring tones.
它们给70小时的待机时间、2小时50分钟通话时间以及15种铃音。
《柯林斯英汉双解大词典》
The standby time is very long.
这个待机时间非常长。
youdao
Vibrating Alert, Games, Long Standby Time, Walkie-talkie!
振动提示，游戏，待机时间长，步话机！
Its battery life: 5 hours on the wireless web. 30 days of standby time.
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In addition, the Ascend W1's 1950mAh battery provides the longest standby time of smartphones in its class.
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The technology also provides long battery life (over 10 hours2 of local HD video playback) and over 3 weeks of standby time.
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