Being a frequent flyer, Bill earns benefits based on mileage of flights taken since he became a salesman 15 years ago.
Being a frequent flyer, Bill earns benefits based on mileage of flights taken since he became a salesman 15 years ago.
从15年前比尔开始做推销员起，他就经常坐飞机来往各地，也因此而享受优惠。