Children were prone to play in hearths, crawl under log-piles, get crushed by carts.
孩子们会在炉边戏耍，爬到园木堆下，也会被车轧。
Holding the body on the side produces no more or no less drag resistance than holding it prone in crawl or backstroke.
保持身体在一侧的姿势产生的拖曳阻力相对保持身体水平的姿势来说是一样的，不多也不少。
Holding the body on the side produces no more or no less drag resistance than holding it prone in crawl or backstroke.
保持身体在一侧的姿势产生的拖曳阻力相对保持身体水平的姿势来说是一样的，不多也不少。
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