It's very clear you don't need a force if something is doing nothing, just sitting there.

显而易见,如果物体没有运动,只是静止状态,那是不需要力的

耶鲁公开课 - 基础物理课程节选

We need to be doing something about inner-city education at early levels.

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People get caught up in that, so they believe that they need to be doing something all the time to be effective money managers.

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"There are people in great need and we're doing something for them that they are very grateful for, " she said.

BBC: North West Wales