只要有足够时间，跟彗星一样的行星最终会完全蒸发掉，但那大约需要一万亿年。
Given enough time, the comet-like planet could theoretically evaporate away completely, but it would take about a trillion years.
目前对于完全蒸发的最佳估计：一万亿年。
The current best estimate to complete the vaporization: a trillion years.
用溶剂完全蒸发法制备了PVA复合膜。
Polyvinyl alcohol(PVA)composite membranes were prepared by means of the solvent complete evaporation.
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