So you may want to spread happiness, through your word.

你也许想传播快乐，通过你的言话。

哈佛公开课 - 幸福课课程节选

This says, if you want to be in the air for a long time, so you may think that 90 degrees is the best angle.

也就是说,如果你想在空中停留更久,你也许会认为 90°是最佳选择

耶鲁公开课 - 基础物理课程节选