If an application is not performing adequately, it is generally more desirable to add more columns to an existing index, or add new indexes to a table as your first options.

如果一个应用程序执行时的性能不合格，较为可取的做法通常是添加更多的列到现有的索引中，或者为一个表添加新的索引，这种做法是首选。

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Although e-bikes first appeared in the 90s, cheaper options and longer-lasting batteries are breathing new life into the concept.

虽然电动自行车最早出现在上世纪90年代，但更便宜的选择和更持久的电池正在给这一概念注入新的活力。

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Choose the dashboard option to show the first three options in one window, each showing a different threshold level.

选择仪表板选项可以在一个窗口中显示前三个选项，每一个都显示不同的临界值水平。

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So what we're doing is filling in those eight electrons following the Aufbau principle, so our first electron is 1s going to go in the 1 s, and then we have no other options for other orbitals that are at that same energy, 1s so we put the second electron in the 1 s as well.

它会是什么样子呢,我们正在做的是将这8个电子按照奥弗,堡原理进行填充,所以我们第一个电子将会进入，然后我们没有其他的,轨道的选择在同一个能级，所以我们把第二个电子也放入。

麻省理工公开课 - 化学原理课程节选

At Friday's council meeting Sedgemoor District Council decided to sell its 60% stake of the land and enter into a development agreement with Tesco which would give it first options on building on the site.

BBC: Tesco Extra store for former Sedgemoor Splash pool site

The CBOE was the first stock options exchange in the world, founded in 1973, spun off by futures traders at the Chicago Board of Trade who were looking for something to trade.

FORBES: Exchange Merger Mania: Who's Next

First, the options in question are real morale-boosters for workers, not an insider enrichment scheme.

FORBES: Not an Option