It wasn’t yet time to start class, so the teacher started to pace back and forth in front of the class, nervously stroking the lock of hair that covered his bald spot.
上课时间还没到，老师便在全班同学面前来回踱步，紧张地抚摸着盖在秃顶上的那缕头发。 
It wasn’t yet time to start class, so the teacher started to pace back and forth in front of the class, nervously stroking the lock of hair that covered his bald spot.
上课时间还没到，老师便在全班同学面前来回踱步，紧张地抚摸着盖在秃顶上的那缕头发。 
