将请求压缩为对象，使您能用不同的请求，队列或日志请求，参数化客户机，并支持可撤销的操作。
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
雇主或雇主代表可随时对一些助手指派和托付一定的任务和权力，也可撤销这些指派和托付。
The Employer or the Employer's Representative may from time to time assign duties and delegate authority to assistants, and may also revoke such assignment or delegation.
可撤销的信用证可以由开证行随时修改或撤销，不必事先通知受益人。
A revocable credit may be amended or cancelled by the issuing bank at any moment and without prior notice to the beneficiary.
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