你应将心思精心专注于你的事业上。日光不经透镜屈折，集于焦点，绝不能使物体燃烧。

=合作导航=

同类推荐

热门内容

广告合作：@
Copyright © 2017-2019 Meeting is a song, we raise our glasses, we sing about wine, pull parents short, count children's affection, talk and laugh, unbridled. Telling the truth is friendship. 版权所有Meeting is a song, we raise our glasses, we sing about wine, pull parents short, count children's affection, talk and laugh, unbridled. Telling the truth is friendship.