ph.

Receipts and Warranties-(收据和质量保证)

1. 呈递，提交，邮寄(参赛作品、求职信等)
If you send in something such as a competition entry or a letter applying for a job, you post it to the organization concerned.

2. 派遣,调来(警察、军队等以应付危机或困难)
When a government sends in troops or police officers, it orders them to deal with a crisis or problem somewhere.

1. mail in
cause to be delivered

e.g. Send in your comments

2. give one's name or calling card to a servant when making a formal visit