across：
adv.从一边到另一边;横过;宽;从…的`一边向…;在对面;在对过；
prep.从…一边到另一边;横过;在…对面;在…对过;在(身体某部位)上；
例句：
The general had to get his troops across the river.
将军必须让部队过河。
There's a school just across from our house.
有一所学校就在我们房子对面。
This view is common across all sections of the community.
该社群所有阶层的人普遍持有这种看法。
The industry needs more investment across the board.
这一行业需要全面增加投资。
