Pharosage
光通量密度, 照度
🗣️ 情景例句
By arranging with the public schools
首先， 从公立学校开始
Pupil. He is studying.
学生。正在学习。
If we remain inveterate smokers, it is only because we have so often experienced the frustration that results from failure.
如果我们烟瘾大，戒不掉，那是因为屡戒屡败，失去信心。