The engine is running idle.

发动机在空转着。

youdao

Reduction of energy losses in hydraulic circulation of a hydraulic machine when its running idle can be brorght about by lowering the no-load circulatory flow rate.

降低液压机空载时液压系统中大部分能量损失可通过减小空载环流流量的途径实现。

youdao

Note: Our test system was idle, with no other activity running, when we ran these tests.

注意：在执行这些测试时，测试系统是空闲的，测试时没有运行其他任何活动。

youdao

Mr Spitzer, never one to be idle, is off to a running start.

ECONOMIST: Governors old and new: The second term-inator | The

Heavy HDD use gave us 40dB, while accessing HDD and spinning up a Blu-ray took this to a deafening 50dBA. Luckily, once a disc was loaded and running, sounds from the drive ceased almost completely and overall system noise remained close to the idle level while actually playing a movie -- the Samsung SH-123L was impressive in that respect.

ENGADGET: How-to: Build a multi-talented HTPC for (roughly) $1,000