A strong objection at once occurred to us.
我们立刻遇到强烈的反对。
According to the information that we have at this time, the incident only occurred once.
就我们目前掌握的情况，这次事件还是一次偶发事件。
An idea occurred to him at once.
他立刻想出一个主意。
This problem has only occurred once.
这种问题只发生过一次。
Once the machinery equipment, large-scale particularly equipment, occurred fault, it will cause very serious consequences.
机器设备尤其像大型的设备一旦发生故障，会造成十分严重的后果。
And his girlfriend had not occurred, I think of it, once to the salon.
和女友也没发生关系，我想起来了，有一次去发廊。
Once symptoms begin to appear, permanent vision loss may have already occurred.
一旦症状开始出现，永久的视力损害已经发生。
He had never been but once at a tiger-hunt, when the accident in question occurred.
其实他只猎过一次虎，就是出乱子的那一回。
Once hydrothorax occurred, treatment was more, difficult, and must be studied...
胸水出现后，治疗极为困难，必须进一步研究。
Once hydrothorax occurred, treatment was more, difficult, and must be studied...
胸水出现后，治疗极为困难，必须进一步研究。
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