Sometimes it's easier actually not touch it to the metal, -- I should have- TA: It's hard to see if it's moving or not.
有时候它更容易不接触金属,我本应该-,助教:很难看到它是否移动了。
麻省理工公开课 - 化学原理课程节选
应用推荐
模块上移
模块下移
不移动