If something moves alongside, it moves so that it is next to another thing.
He waited several minutes for a car to pull up alongside.
他等了几分钟,直到一辆车开过来停在了旁边。
If one thing is alongside another thing, the first thing is next to the second.
He crossed the street and walked alongside Central Park.
他过了马路,然后在中央公园旁边走着。
If you work alongside other people, you all work together in the same place.
He had worked alongside Frank and Mark and they had become friends.
他曾与弗兰克和马克并肩工作过,他们已经成为朋友了。