walk/run/swim across sth
across 后接被穿越的空间，如 street、river、room，表示从一边到另一边。
He swam across the river.
他游过了那条河。
穿过；横过；从…的一边到另一边
在…对面；在…另一边；横跨；跨越；遍及；在…各处；在（空间）的那一头；在…远端；交叉；横在…上；斜穿
from one side to the other of
指动作方向，如 walk across the bridge 走过桥
到、朝向或从某物的远处一侧(该物位于两个兴趣点之间)。
To, toward, or from the far side of (something that lies between two points of interest).
在某物的对面(该物位于两个兴趣点之间)。
On the opposite side of (something that lies between two points of interest).
从一侧到另一侧穿过(被穿越的空间)。
From one side to the other within (a space being traversed).
在(一个空间)的远端或附近。
At or near the far end of (a space).
跨越。
Spanning.
遍及。
Throughout.
以一定角度相交或穿过。
So as to intersect or pass through or over at an angle.
掌握关于某事的全部最新信息。
In possession of full, up-to-date information about; abreast of.
We walked across the bridge to get to the other side of the river.
我们走过桥，来到河的另一边。
用法提示：此处 across 是介词，表示“从一侧到另一侧穿过”，后接名词 bridge。
The supermarket is just across the street from my house.
超市就在我家街对面。
用法提示：此处 across 是介词，表示“在…对面”，后接名词 street。
She spread the map across the table so everyone could see it.
她把地图摊在桌子上，以便每个人都能看到。
用法提示：此处 across 是介词，表示“横跨/覆盖在…表面上”，后接名词 table。
across 后接被穿越的空间，如 street、river、room，表示从一边到另一边。
He swam across the river.
他游过了那条河。
across from 表示“在……对面”，介词 from 不能省略。
The café is across from the station.
那家咖啡馆在车站对面。
与 the world、the country 等连用时，across 表示“遍及、在……各地”。
Fans across the world watched the final.
世界各地的球迷都观看了决赛。
grammar · medium
易错句子Look both ways before you across the street.
正确表达Look both ways before you cross the street.
across 是介词或副词，不能单独作谓语；表示“横穿、穿过”这个动作时必须用动词 cross。所以从句里作谓语的应是 cross，而 across 只能跟在动词后作状语或介词短语，如 walk across the street。
grammar · medium
易错句子The train went across the tunnel and came out the other end.
正确表达The train went through the tunnel and came out the other end.
across 强调从平面或区域的一边到另一边；through 强调在三维的、封闭的空间内部穿过。隧道是有顶有壁的封闭通道，所以用 through，不能用 across。
grammar · medium
易错句子The bank is across my house, so it's very convenient.
正确表达The bank is across from my house, so it's very convenient.
要表达“在……的对面”，英语用 across from + 地点（相当于 opposite），不能只说 across + 地点。单独的 across 后面接的是被横穿的平面或空间，如 across the street，而不是对望的参照物。
在街对面
She lives across the street.
她住在街对面。
在河对岸；过河
There is a bridge across the river.
河上有一座桥。
全国各地；遍及全国
They traveled across the country by train.
他们乘火车游遍全国。
全世界；遍及世界各地
English is spoken across the world.
全世界都讲英语。
在…对面
The bank is across from the post office.
银行在邮局对面。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
全面地；包括所有人或所有方面
The company gave everyone a raise across the board.
公司给所有人全面加薪。