Two small pouches, placed in the bottom of a shoe, are filled with the fluid and generate a current whenever they are compressed by the foot’s up and down motion.

当他们将两个装有该流体的小袋子置于鞋内时，它们就会因人脚抬升和下落的动作而受到挤压，从而产生电流。

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The current international security environment is complex and fluid. Nuclear proliferation remains a pressing issue and nuclear disarmament a long and arduous task.

当前，国际安全环境复杂多变，核扩散问题依然突出，核裁军任重道远。

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Background: Recent studies have challenged current guidelines on fluid resuscitation.

背景：近期的研究对当前液体复苏指南提出了挑战。

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Instead, he has decided to design the car wholly using computational fluid dynamics - which current teams use alongside wind tunnels.

BBC: Lucas di Grassi joins new-look Virgin Formula 1 team