across 可作副词和介词
adv.横过；穿过；朝向特定的方向；在对面；横写地
Can you swim across the river? 你能游到河的对岸吗
prep.横过；穿过；在对面；在(身体某部位)上；在…各处
A big tree fell across the ditch.一棵大树横贯沟渠倒下.
其动词是CROSS
穿过；交叉；杂交；反对；勾掉；碰见；阻挠
It's very dangerous for children to cross the busy street.对孩子们来说,穿过车来车往的街道很危险.
Meet me at the point where the two paths cross.我们在那两条路的交叉点见面吧.
cross还可做形容词和名词
n.十字架；十字形；杂交动植物；苦难
adj.交叉的；相反的；生气的；杂交的