珊蒂寫字樓

A BB gun is a pneumatic gun (氣槍) usually powered by

compressed gas(高壓的氣體), electric revolution(電子迴路),

or a spring(彈簧). Most BB guns are shaped like normal guns

but can look like toys. Some have reservoirs(彈匣) to store

ammunition (子彈), some are breechloaders(後面上膛), and

others are muzzleloaders (前面上膛).

The name of the gun refers to the original ammunition it used,

which came from the lead shot(彈藥) used in a shotgun shell(彈殼).

"BB" (0.18 inch) was the size between "B" and "BBB";

modern rounds (子彈) are made of non-toxic steel, plastic, or

copper(銅), and are usually .177 caliber(口徑)(=4.5 mm).

BB is often mistaken to stand for "ball bearing", which BB ammunition

resembles(相似), but there is little to suggest that this connection is

intentional.

叫做BB槍(彈)是因為子彈的大小介於"B"和"BBB"之間(子彈規格)，
所以叫作BB槍。BB級的規格是0.180英吋直徑(4.572mm)

為標準值的鉛珠，雖然玩具空氣槍的子彈規格已不再用

BB級的子彈, 但是BB這個名字已經被泛用了.