For example, a helpdesk agent updating tickets entered in the system has access only to the fixed set of options. The list is set and provides no means of freeform entry.

比如，一个进入该系统的helpdesk代理更新许可仅仅能访问固定的选项集。

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The agent that updates the index database with new documents is currently rather slow and is not optimized, which can be fixed by adding a couple of tracking fields to the index documents.

使用新文档更新索引数据库的代理目前速度很慢，且未进行优化，通过添加一对跟踪字段到索引文档中就可以解决这一问题。

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A new type of fixed bed LPG mercaptan oxidation catalyst and activated carbon sweetening agent have been developed in laboratory.

在实验室研制出新的固定床液化石油气硫醇氧化催化剂和活性炭脱硫剂。

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The drilling companies typically acquire leases with landholders who have access to oil and mineral rights below their land by using a landman (either an employee of the company or an independent agent), who offers a fixed price per acre for the right to drill, plus a royalty percentage of the value of the produced hydrocarbons.

FORBES: Shale Leases: Promised Land