Dr. Covey compares being in the world today to being in permanent whitewater: "We live in a constant, churning, changing environment.

Covey 把当今世界比作永久性的湍流：“我们生活在一个不断搅动变化的环境中。

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As any parents of a young child who is a problem sleeper will confirm, permanent tiredness and constant irritability can put a huge strain on your relationship.

对于任何家里有不肯好好睡觉的幼童的父母，他们都会证实这一点：长期的疲倦和持续的烦躁会让你的感情关系承受巨大压力。

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In the welding course can realize constant current supply and permanent percentage and controls and line voltage compensation etc.

同时在焊接过程中，实现恒流、恒百分比控制、网压补偿等多种算法。

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These positive effects are transitory, however, when local economies have insufficient permanent employment to justify a constant level of demand for new housing stock.

WSJ: Robert Bridges: A Home Is a Lousy Investment

In his report, Mr Laidlaw also noted constant changes of permanent secretary at the DfT and said resources were "excessively stretched due to the government's spending review and the competing pressures of other projects".

BBC: West Coast Mainline deal failure criticised

Now, in an era of constant polling and the permanent campaign, elections no longer confer much authority on the victor.

ECONOMIST: Presidential nominations