A .45 is a pistol whose bullets are 0.45 inches across — much fatter than a .22. People say a forty-five in American English.

A .45 is a pistol.45 是一種手槍， whose bullets are它的子彈 0.45 inches across直徑 0.45 英寸—— than a .22比 .22 的 much fatter粗上一大圈。 in American English在美式英文裡， People say人們把它唸作 a forty-five。

It is thought of as a heavy handgun: more punch, more jump in the hand, often linked in films and news to police or army pistols of the last century. You can mean the gun or the round.

It is thought of as它被看成 a heavy handgun一把重型手槍： more punch火力更猛、 more jump in the hand打起來手上的彈跳更大， often linked in films and news to在電影和新聞裡常被連到 police or army pistols of the last century上個世紀的警用或軍用手槍。 You can mean你說它時，可以指 the gun or the round那把槍，也可以指那種子彈。

Though actually, 0.45 inches is just the width; different .45 rounds exist, and not every .45 is the old army Colt. The word is informal and spoken; a careful label would say a .45-calibre pistol. In British English you may hear the same name, but the spelling calibre is more common on the page than caliber.

Though actually不過其實， 0.45 inches is just the width0.45 英寸只是子彈的粗細； different .45 rounds exist.45 的彈種其實有好幾樣， and not every .45 is而且不是每一把 .45 都是 the old army Colt那把老的軍用柯爾特。 The word is informal and spoken這個說法口語、非正式； a careful label would say講究一點的標示會寫 a .45-calibre pistol一把 .45 口徑手槍。 In British English在英式英文裡， you may hear the same name你也會聽到同一個叫法， but the spelling calibre但 calibre 這個拼法， than caliber比起 caliber， is more common on the page在書面上更常見。