Two mules well laden with packs were trudging along.是什么意思？

Two mules well laden with packs were trudging along.

两头骡子驮着沉重的背包,吃力地往前走.

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

mules

n. 骡( mule的名词复数 )，拖鞋，<口>顽固的人，越境运毒者；

例句
Open - Toed or Backless Shoes: And mules a definite no - no.
露趾的或者无后跟的鞋子: 拖鞋是绝对不能穿的.

well

adv. 好，很，好意地，高高兴兴地；adj. 健康的，井的，良好的，恰当的；int. （用于表示惊讶，疑虑，接受等）；n. 泉，源泉，水井；vi. （液体）涌出，流出，涌流，涌上；vt. 涌出，喷出；

例句
He was well acquainted with the literature of France, Germany and Holland...
他对于法国、德国和荷兰的文学了如指掌。

laden

adj. 满载的，负载的，受压迫的；vt. 装载(lade的过去分词)；

例句
I came home laden with cardboard boxes...
我抱着一大堆纸箱回了家。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

packs

n. 一群( pack的名词复数 )，包裹，（纸牌的）一副，一组；v. （把…）打包( pack的第三人称单数 )，塞进，拥进，（使）聚集成团；

例句
W. Somerset Maugham's novel still packs an emotional punch.
威廉·萨默塞特·毛姆的小说仍具有强烈的情感冲击力。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

trudging

vt.& vi. 跋涉，吃力地走（trudge的现在分词形式）；

例句
After trudging for some distance, his slow steady steps acted as a soporific.
及至走出来一些路,脚步是那么平匀, 缓慢,他渐渐的仿佛困倦起来.

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。