external force

基本解释

Every developer becomes aware of the concept of technical debt, whereby you make compromises in your design for the sake of some external force, such as schedule pressure.
每位開發人員都開始注意到技術債務的概唸，您可能由此而迫於外部壓力（例如日程壓力）在設計中有所折衷。
If you are completely present, the external forces are no longer a problem, because there is only you and that external force, in this moment, and not a million other things you need to worry about.
如果你是完全專注於眼前的事情，那麽外部因素將不再是問題。因爲在此刻，唯有你和那個外部因素，沒有成千上萬的其它事情需要你擔憂的。
If the external force on the squash racquet were zero, then it would continue to go always with the same velocity, the center of mass.
若壁球板受外力爲，它可能會一直運動,保持同樣的速度，而整躰的中心。

So the force that you're pushing down on here is the external pressure times the area.
或者壓縮功的概唸,在活塞上施加壓力。
麻省理工公開課 - 熱力學與動力學課程節選

While with effort the water can be pushed out of its puddles, when the external force is no longer applied, the water will re-puddle exactly as before.
WHITEHOUSE: Engage and Connect
It could be that being a risk-taker drives you to play more games, or that some external force makes you both play games AND be an unsafe driver.
FORBES: New Study Claims Gamers are More Unsafe Drivers
Had I been stopped by some external force?
ENGADGET: This is the Modem World: It's my movie

外力
The basic idea of the active contour is to make a contour move to the destination with the internal and external force.
活動輪廓的基本思想是利用一條曲線在內力和外力的共同作用下,移動到我們所期望的位置。
物理學
外力