past介词：路过,经过 I walked past the shop yesterday. through介词:传过,通过(某一空间或区域) The sun shines into the house through the window. cross 动词:横穿,横过 Don't cross the street while the red light is on. across介词:横穿,横过（强调平面距离） You may cross the street while the green light is on.
