The so called maths summary is to summarize, by a certain way, the various meanings of a branch of its structural element such as conception, proposition, formula and sign etc.

所谓数学解释，就是以某种方法对数学某一分支或者构成它的成分，诸如概念、命题、公式、符号等所赋予的各种意义的总和。

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You just create multiple versions of your website, define what your visitor goals are (download, sign up, purchase, etc.), and then they split your traffic between the different versions.

你只需创建多个版本的网站，确定你访客目标(下载，注册，购买等)，然后在不同版本之间的切换流量。

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Delays getting client to sign-off on acceptance tests – this is true not only for sign-off but also getting client time for resolving requirement issues, give feedback on demos etc.

客户签收验收测试时的延迟——不仅在这方面，还包括让客户解决需求问题、提供演示反馈等方面。

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Filler added that those in the photovoltaic field hope to see solar conversional devices in everything we own, including roof shingles, sign posts, clothing, etc.

FORBES: iPhone 2.0: Solar-Powered Mobility

Marketers buy the ads and then figure out their return on investment based on how many people click on them, "like" them (remember the value of a "like") or take some other action (sign up for a contest, download, etc.).

FORBES

But to be fair to both sides, I also question the wisdom of the idea that the current pullback in stocks is a sign that market players are concerned about the economy (or Greece, China, etc.).

FORBES: Confessions of a Market Environmentalist