徒劳,白费气力;徒劳之举;捕风捉影;徒劳无功;
He raised his forefinger and beat the air oldly before his voice spoke.
他举起食指,老谋深算地在空中摆了几下才说下去.
All you are doing is to beat the air . Try to be more practical.
你目前所做的一切都是徒劳无功的.
Helicopters don't fly. They beat the air into submission.
直升机不会飞, 它只是让空气屈服而已.
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