In particular, making schema changes or adding indexes to a database with more than 10-20 million rows completely locks the database for hours at a time.

尤其是有一两千万行数据的时候，每次修改模式、往数据库中添加索引都会数小时完全锁定数据库。

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For it to be held that way, rather than getting more and more curved over time, the amount of matter and energy it contains must be at a particular, critical density.

而根据这个状态，不是随时间而越来越弯曲，它所拥有的物质与能量必须在一个临界的，特别的密度。

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You should remain conscious of time limits during the test, and you should move on rather than spending too much time on a particular question to which you are unable to find the answer.

在考试中要有充分的时间意识。你们应该不断地往下做题而不是花太多时间在你找不到答案的某一具体问题上。

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One can't help but be a little curious as to why the issue wasn't raised at that time rather than at this particular time and a Democrat colleague of hers on the commission has strongly endorsed both her nomination for the chairmanship and her performance as a commissioner.

CNN: Senators discuss consumer safety nominee

Those queries are hard to answer but pondering them is far more useful than asking whether taxes will rise or fall relative to a baseline, or whether it will take more or less income out of the pockets of those in a particular income group than it did at some time in the past.

FORBES: Scoring Tax Reform: Budget Baselines Don't Really Matter

One would think that Speaker Boehner and his staff would have had more important things to do on this particular Sunday morning than wasting time engaging in a useless school yard fight.

FORBES: The United States Congress-A Confederacy of Losers