空客参考语言空客批准的缩略语手册(AAAH)(20) ... OPT Optimum 昀佳的 OPT Optional 可选的，选装的 OPV Overpressure Valve 过压活门，超压活门 ...
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... OPPT Opponent(s) 对方，敌方 OPT Optional 选择，选择性 O/S Outside 旁门，边花（将牌以外的花色） ...
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OPT-Optional Practical Training 毕业实习
opt optional
选择可选
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It's important to note that Popcon is an optional opt-in service, so the total number could actually be far in excess of 10, 000 users.
要知道，Popcon只是个可以选择加入的服务例程，所以实际用户数应该远远大于1万。
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The feature is optional and opt-in.
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The detachable unit consists of a 3.5-inch LCD which gets its navigation information from an SD card, and if you opt for TomTom's optional service package it'll provide real time traffic info as well.
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Most employers find that even Optional Practical Training (OPT) has limitations as well.
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