When we did the spring, we had this theory of Hooke's Law that told us something, and we built a simulation, or built some tools around that theory.

当我们写弹簧程序的时候,我们有胡克定律来告诉我们原理，然后我们建立了一个仿真模型，或者说是在这个理论基础上建立了一些工具。

麻省理工公开课 - 计算机科学及编程导论课程节选

The United States is strengthening its intelligence, military and security capabilities and drawing from a full range of law enforcement tools in coordination with partners around the globe.

WHITEHOUSE: Press Briefing

Our plan would give law enforcement additional tools to prevent and prosecute gun crime by making gun trafficking a Federal crime with serious penalties, helping communities put 15, 000 cops on the street, and taking other common-sense steps.

WHITEHOUSE: Our Top Stories

We will do this by ensuring law enforcement has the tools it needs at the state, local, federal and international levels.

WHITEHOUSE: Our Top Stories