a bridge (laid) across the river 一座横跨于河上的桥
across the street 跨街;在从街的一侧
go across the road 横穿马路
swim across a river 游过河
live across the river 住在河对面
a house across the street 街对面的一所房屋
from across the sea 来自海外.

lay one stick across another 把两根棍棒交叉成十字
across each other 二者彼此交叉
with a rifle across one's shoulder 肩上扛着一杆枪
across country
be across a horse's back 骑着马,骑在马背上
across the country [world] 全国[全世界].

hurry across to the other side 急急忙忙地走到对面
a lake 5 miles across 一个5英里宽的湖.

with one's arms [legs] across 双臂[两腿]交叉.