Rifles should be regularly pulled through with a piece of flannelette.是什么意思？

Rifles should be regularly pulled through with a piece of flannelette.

步枪的枪膛要经常用绒布擦拭.

rifles

n. 步枪( rifle的名词复数 )，来福枪；

例句
Marines with rifles guarded them...
手持步枪的海军陆战队士兵监视着他们。

should

应该，将会，可能，本应；

例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

be

v. 是，有，存在，做，成为，发生；aux. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质；

例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

regularly

adv. 有规律地，按时，照例，按部就班地，整齐地，有条不紊地，经常，不断地，定期地；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。

pulled

v. 拉( pull的过去式和过去分词 )，扯，拉过来，划（船）；

例句
Billy Hardy has pulled out of his second fight against Noel Carroll after a training accident.
一次训练事故之后，比利·哈迪退出了和诺埃尔·卡罗尔的第二次比赛。

through

prep. 通过，穿过，经由，透过，凭借；adv. 从头到尾，彻底，自始至终；adj. （电话）接通，通话完毕，有洞的，直达的；

例句
The proposal was instantly voted through with two to one in favour, accompanied by enthusiastic applause...
在热烈的掌声中，提案以2比1的优势很快通过了表决。

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。

piece

n. 块，片，段，部分，部件，文章，音乐作品；vt. 修补，连接，接上；

例句
Mrs. Madrigal buttered another piece of toast...
马德里加尔夫人给另一片烤面包涂上了黄油。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

flannelette

n. 棉织法兰绒，绒布；

例句
Rifles should be regularly cleaned by pulling a piece of flannelette through.
步枪应定期用一块绒布擦干净.