With series ventilation underground, production activities in many places were running under little or even no airflow. Motor tricycles without explosive-proof quality were used underground.

井下串联通风、多处无风微风作业，使用非防爆机动三轮车。

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When you put on the film you see physicality, explosive pass rush and a high motor.

NPR: Browns, Free Agent LB Paul Kruger Agree To Deal

Jeter was obtaining an all encompassing education on the synchronization of his motor units and how to maintain powerful and explosive movements over the course of a 162 game schedule.

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