口径

❶caliber; bore; diameter
❷specifications; line of action; approach; version
说话～不一致。They did not speak along the same line./对～ arrange to give the same version (or account) of sth; compare notes so as to give the same story/统一～ agree on a uniform version(or account)/对外～standard version (or account) for external consumption;unified statement for the public/～155毫米的大炮155mm gun/小～步枪small-bore rifle