We tend to meet up for lunch once a week.我们往往每周共进一次午餐。Lung cells die and are replaced about once a week.肺细胞约每周新老更替一次。Meat was available once a week if at all.就算有肉，也是每周才吃一次。...
The land on hilltops and hillsides was all cropped.山顶和山坡上的地全都种了庄稼.The plane grazed the hilltops.飞机擦着山顶飞过.So let freedom ring from the prodigious hilltops of New Hampshire.所以,让自由的回声响彻新罕布什尔州连绵不绝的山头吧!...