... built-in operational test；内部运转试验 built-in safety feature；内装安全装置 built-in service tool；随机维修工具 ...
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built-in safety feature
内置安全功能
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One manufacturer had to recall a heart defibrillator because its built-in safety feature would shut it down if it had not been serviced recently and it thought 2000 was 1900.
ECONOMIST: Please panic early
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