） Don't just sit there! If you're not actually going to take part in this class, you're not going to learn anything! （别光坐在那！ 如果你不参与到这堂课里的话，你就学不到任何东西！ ） Phil So, next we've got 'join in'. It can mean ...

At this point, you or someone you know has probably been targeted with an ad from MasterClass — the online learning platform that launched in 2015 and now has more than 85 classes led by famous ...