Depending on the necessity, one can choose to maintain this or not maintain it.

取决于必要性，一个人可以选择维护这个或不维护。

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Take regular physical activity: At least 30 minutes of regular physical activity every day helps to maintain cardiovascular fitness; at least 60 minutes on most days helps to maintain healthy weight.

经常锻练身体：每天至少30分钟经常锻练身体有助于保持心血管健康；在大多数日子至少60分钟有助于保持健康体重。

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With a collection of ways to maintain simple state on the client, and a collection of ways to maintain detailed and complicated state on the server, what is missing is a connection between them.

我们能够在客户机上维护简单的状态，也能够在服务器上维护详细的复杂状态，所缺少的是它们之间的连接。

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Farmers lack enough inputs to maintain soil fertility is parts of many developing countries, especially in Africa south of the Sahara.

VOA: special.2009.07.28

But the second is a desire to attract and maintain the divine presence, the continued presence of God in the sanctuary.

第二个是一种欲望，想要吸引和保持，上帝长久存在于圣所内的欲望。

耶鲁公开课 - 旧约导论课程节选

He would remain a virgin in order to prepare for and to maintain this incredibly important role as an epic poet.

他想保持自己的童贞,为了准备和保持作为史诗诗人这个无比重要的角色。

耶鲁公开课 - 弥尔顿课程节选

Just as China is said to need 8% growth in order to maintain social stability, India probably needs to grow at 6% or more to maintain financial stability.

ECONOMIST: India��s economy

The algorithm can be configured to maintain "constant image brightness" (which results in lower power consumption) or to maintain "constant illumination power" (which results in higher image brightness).

ENGADGET: DLP's IntelliBright tech promises brighter pico projection at no extra power

While the State of California requires its political subdivisions to maintain a revenue reserve fund, its legislature has repeatedly failed to approve proposed legislation requiring the State itself to maintain such a fund.

FORBES: Fairy Tale Ending For Government Deficits