大约半小时以后。
The Pacific tsunami warning centre in Hawaii issued a tsunami warning soon after the quake struck, but withdrew it about 30 minutes later.
位于夏威夷的太平洋海啸中心在地震后马上发布了海啸警告，但是在大约30分钟后解除。
That drove several thousand of the marauders out of the museum complex in minutes, he said, but when the tank crewmen left about 30 minutes later, the looters returned.
几千抢劫者就这样在数分钟内被驱赶出博物馆，他说，但是当坦克里的士兵离开大约30分钟以后，抢劫者又回来了。
The Twin Otter plane took off at 1:30 pm before losing contact about 10-15 minutes later.
这架型号为"双水獭"的飞机于当日13:30起飞，起飞10-15分钟后与地面失去联系。
30 minutes later I'm already sitting in the bus. It's about 20 minutes drive to the south of Beijing.
过了半个钟头，我坐在大车上了，往城南要开差不多二十分钟。
30 minutes later I'm already sitting in the bus. It's about 20 minutes drive to the south of Beijing.
过了半个钟头，我坐在大车上了，往城南要开差不多二十分钟。
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