口徑
?caliber; bore; diameter
?specifications; line of action; approach; version
說話～不一致。They did not speak along the same line./對～ arrange to give the same version (or account) of sth; compare notes so as to give the same story/統(tǒng)一～ agree on a uniform version(or account)/對外～standard version (or account) for external consumption;unified statement for the public/～155毫米的大炮155mm gun/小～步槍small-bore rifle