1 sentence

1. 他练习收报和发报已经很久了，动作非常熟练。

   tā liàn​xí shōu​bào hé fā​bào yǐ​jīng hěn jiǔ le, dòng​zuò fēi​cháng shú​liàn.

   He has been practicing sending and receiving telegrams for a long time, and his movements are highly proficient.

   Source: Dong Chinese Dictionary