They trotted along behind him.是什么意思？

They trotted along behind him.

他们跟在他身后疾走。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

trotted

v. 小跑，急走( trot的过去分词 )，匆匆忙忙地走；

例句
Eighty horses trotted up.
80匹马小跑起来。

along

adv. 一起，向前，进展，到某处；prep. 沿着，顺着，靠着…边；

例句
The helicopter can zip along at about 150 kilometres an hour.
该直升机能以每小时150公里左右的速度疾进。

behind

prep. （表示位置）在…的后面，支持，（表示顺序）在身后，（表示比较）落后于；adv. 在后面，向后，在后面较远处，（落）在后面；n. 〈口〉屁股；

例句
Ken was in the act of paying his bill when Neil came up behind him.
当尼尔从后面走过来时，肯正在付账。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。