Mysterious strangers and other random objects can then appear out of thin air and disappear just as quickly.
神秘的穿梭者和其他自由物体能从稀薄的空气中出现，然后又很快消失，象他们的出现那样迅速。
The virtual particles spontaneously created in the quantum vacuum appear and then disappear so quickly that they can't be directly observed.
量子真空中自发产生的虚粒子以不被察觉的速度出现与消失。
And then you would recover for a while, that initial phase of the illness would disappear, your fever might go down, you might appear to be normal.
接着你会暂时恢复，在开始阶段出现的症状会消失，你的体温会降下来，看起来似乎比较健康。
These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all.
这些问题可能出现后又消失，有时很长时间没问题。
These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all.
这些问题可能出现后又消失，有时很长时间没问题。
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