stamp邮票;envelope 信封;
package / parcel 包裹;
parcel form包裹单;zip code邮编;
weight重量;overweight 超重;
postage邮费;extra postage 额外邮资;insurance保险;
send / post / deliver a letter / mail 寄 /发信;
delivery投递，传送;claim领取;
express mail 快件;EMS特快专递;
airmail 航空信件; surface mail 平邮;
ordinary letter平信;
registered letter挂号信。