After being warned by his mother to swear off that demon knuckle cracking, young Donald Unger tested the accuracy of this hypothesis on himself.
自从小时候受到母亲警告说不可以敲打指关节后，小唐就开始在自己的身上测试这种推断的准确性。
2
Left South Africa with five goals, four of which were superb strikes from distance, including a cracking volley in the third-place play-off against Germany.
弗兰在本届世界杯共奉献五粒进球，其中四粒都是世界波，包括在与德国争夺第三名的比赛中的一脚凌空抽射。
3
The shale roof-made of the sediment that destroyed the forest so long ago-is cracking and flaking off now that the coal below it has been removed.