If you're a fan of raiding with cloaked units, by all means buy any upgrade that enhances cloaking ability (energy boost, etc).

如果你是隐形单位的偷袭爱好者，全力升级隐形技能(能量增加等等)。

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If it feels too hard, soft, lumpy, etc., or the mattress is older than 10 years, then it is time to upgrade.[19]

如果你的床太硬或太软或有硬块，也或者你的床垫已经用超过10年，那么是时候换一张床了。

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The knowledge of network capacity expansion is widely used in Transformation of urban transport network, power network upgrade, and communication network optimization etc.

城市交通网络改造、电力网络升级、通信网络优化等，都要用到网络容量扩张方面的知识。

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Multi-function printers are becoming popular with enterprises as they provide combined multiple functions such as printing, fax, photocopying, scanning etc. and as companies upgrade to the new line of printers, we can expect this division to maintain profitability.

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For example, if you play as a Republican candidate, you can sink a bunch of resources (upgrade your campaign headquarters, pump money into the ads, etc.) into taking a huge, traditionally Democratic state such as Illinois.

CNN: Computer game lets you run a presidential campaign

Consumers are eager to upgrade anyway because of the added benefits (new features, a faster processor, an improved camera, etc.) of buying the latest iPhone.

FORBES: Apple Reduces 2013 Full Year Orders For iPad