1. Excuse me. Is this the parcel post counter?
请问，这是寄包裹的柜台吗？
还能这样说：
Do you take parcels here?
Excuse me, can I post this parcel here?
应用解析：
in excuse of 辩解；
offer excuses for 找借口，推诿；
without excuse 无故；故意；
excuse oneself 替自己辩解；（为某事）表示歉意
2. Please send this parcel for me.
请为我寄这个包裹。
还能这样说：
I'd like to send this parcel.
I need to mail this package.
谚语：
Come day, go day, God send Sunday.
过了一天又一天，上帝快给个星期天。（懒惰者的愿望）
3. I'd like to have this parcel delivered to Taiyuan.
我想把这个包裹寄到太原。
还能这样说：
I want to send this package to Taiyuan.
I want to mail this package to Taiyuan.
应用解析：
deliver oneself to 向……投案，向……自首；
deliver over 交出；移交；
deliver the goods 交货；履行诺言；不负众望
4. I want to send the package C.O.D.
我想用“货到付款”的方式寄包裹。
还能这样说：
I would like to send the parcel by C.O.D.
I'd like to post this package by C.O.D.
应用解析：
pack cards with 与……共谋，串通；
pack sth. away 将某物放入盒或箱等中收起；
pack sth. in 放弃或抛弃……
pack sth. out 人挤满（电影院，剧院等）