There's like 18 knobs, you turn a knob up or down, and you're there. The outcome is pretty measurable.

温控系统大概有18个温控旋钮，你可以把一个旋钮调高或调低，结果都是很容易衡量的。

youdao

And the experimenter is back there with the speed knob and at random intervals he just speeds up the tape of their heart and then slows it down.

实验者回到实验室，带着录音设备,随机地,他加速了心跳的录音,然后又慢下来。

耶鲁公开课 - 心理学导论课程节选

Push the backlit engine-start button and the dashboard air vents automatically rotate open while the rotary shift knob rises up from the center console.

FORBES: A Jaguar With A Four-Cylinder Engine...Really?

People turned a knob and an EKG-like graph showed up on the computer screen.

FORBES: Not Your Grandmother's Presidential Debate

Get the fuel-air mixture a few knob twists wrong from the LOP side, and you can blow up your engine.

FORBES: Institutional Stupidity, III