You can also join in as many classes as you like for free.

你可以免费加入你喜欢的很多课程。

Then you can watch the dancers in the ballroom and join in as well if you want.

然后呢大家可以去舞厅看舞者跳舞，如果大家想的话也可以加入。

His heart swelled with happiness and relief, and he felt like joining in as they heard Sirius tramping past their door towards Buckbeaks room, singing 'God Rest Ye, Merry Hippogriffs' at the top of his voice.

他的心里涨满了快乐和解脱的感觉，听到小天狼星在门外高唱着" 上帝保佑你，快乐的鹰头马身有翼兽" 朝巴克比克的房间走去，他都想跟着唱。