I have a thank you letter I need to write but there are two more people I need to send a letter to also and it would be efficient to send them at the same time.
我要给你写封感谢信，但是我还得给另外两个人写信，只需要写一封信，同时发给他们，这样更有效率，因为还没给他们写，所以也没给你写。
A piston engine is said at best to be only 33% efficient.
一台活塞式发动机被充其量说只成为有效率33%。
On the physical plane it will be very short and very efficient and it will happen at the event.
在物理层面，它会很快，并很有效率，将会在事件期间发生。
At the same time, hotels must also be profitable and operationally efficient.
与此同时，酒店也必须带来盈利与营运效益。
It equipment could be operating at its least efficient voltage rating.
IT设备可能以最低效率的额定电压工作。
In everyday life we could not function at all without it. In its own field it must be efficient but there is a state of mind where it has very little place.
缺少了它，日常生活几乎无法进行，它在自己的领域内，必须发挥功效，但是在某一种心智状态中，它是没有什么容身之地的。
In everyday life we could not function at all without it. In its own field it must be efficient but there is a state of mind where it has very little place.
缺少了它，日常生活几乎无法进行，它在自己的领域内，必须发挥功效，但是在某一种心智状态中，它是没有什么容身之地的。
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