股票交易中， 委托这个概念怎么翻译？

1. 股票交易中， 委托这个概念怎么翻译？

委托：entrustment

参见下面的中英文对照短文。
 
If you want to buy or sell securities in the market, you must entrust member company's broker to make the dealing, register for the roll and open a capital account and a securities account. Entrustment may include personal interview, contracts by telephone, telegraph, telex and letters. Entrustment price is divided into market price and limited price. The term of entrustment is divided into one-day and five-day validity.

  如果有人想在市场上买卖证券，必须委托会员公司的经纪人才能进行交易，名册登记，开立资金账户和证券交易账户。委托手续包括私人会见，通过电话、电报、电传和信函订立合约。委任价格分为市场价格和限制价格；委托期限分为当日有效和五日有效。