The conventional pumping unit is still the main pumping unit in the field at present, the main reason is that its structure is simple, operation and maintain are convenience, and its use life is long.

目前各油田的抽油设备主要仍为常规游梁式抽油机，其主要原因是该机结构简单，操作维护方便，使用寿命长。

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Our systems are meant to optimizing the space available and to maintain the same level of comfort and convenience in an economical fashion.

我们的活动隔音屏风系统将可用空间运用得更完美，在经济效益前提下，更为您带来更多方便与舒适。

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Programming based on Framework has higher development rate, less opportunities to be wrong, more convenience to maintain.

基于框架的编程采用了模块化方式，开发方便快捷，出错机会小， 维护方便容易，能明显提高开发效率。

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We've got to recognize that we've got to maintain the comfort and convenience that our customers are accustomed to in this country, and we've got to spur economic growth in this country.

FORBES: James Rogers

This increases customer convenience and encourages them to maintain their HBO subscriptions.

FORBES: Time Warner Feeds Golden Goose With HBO Streaming App

Amazon seeks to maintain customer loyalty by price, variety and convenience.

FORBES: Amazon Hits $200 If Free Cash Flow Creeps Up To 10% Of Revenue