four-and-aBNC¹⁷³⁹⁹⁵⁺² 例句 Target weight gain is2kg— or, roughly, four-and-a- half pounds a week. 目标体重增长是每周两公斤，或者至少四又二分之一磅。 yeeyan Which suggests comets deposited water on the ancient moon, shortly after its formation four-and-a- half billion years ago. 这表明,在45亿年前月球刚刚形成其构造后不久，彗星就在古月球上留下了水。 yeeyan