她说，承认火在人类生活中必然存在这一态度，对于制定确保火的使用尽可能安全的法律、政策以及惯例来说至关重要。
Acknowledging fire's inevitable presence in human life is an attitude crucial to developing the laws, policies, and practices that make it as safe as possible, she says.
学会火的使用可能有助于于50,000到60,000年前离开非洲的早期人类成功对付欧洲更冷的气候条件。
Knowing how to use fire may have helped the early humans who left Africa 50,000 to 60,000 years ago to cope with colder conditions in Europe.
弹头（在枪膛中）的前进过程中，铁制子弹（此处指底座上的铁质闭锁，也有使用软木制作闭锁的——译注）会膨胀，紧咬住螺旋形的膛线，使得射程和精准度都大大增加，同时减少子弹死火。
On its way, the iron bullet expanded, gripping the spiral rifling and spinning so tightly along its course that its range and accuracy were greatly increased, with fewer misfires.
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