Although the functions that accept callback functions are powerful, there isn't a good way to do a one-off callback function without some very inelegant work.
虽然接受回调函数的函数功能十分强大，但是没有一种好方法可以执行一次性回调函数，而无需执行一些非常笨拙的工作。
This also shows that the function is not the kind of solvent to dissolve all the ink is very good, including acetone and butanone.
这也标明不是哪种溶剂对一切墨水的溶解功能都是很好的，当然也包括丙酮和丁酮。
Faults: with large area refrigeration effect is not very good, no dehumidification function, high temperature of the place with bad, when using, also increase the humidity in the air.
缺点：对于大面积制冷效果不是很好，没有除湿功能，温度高的地方不好用，使用时还增加空气中的湿度。
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