Flintlock: Ignition system for firearms early 16 th century, it 'superseded the matchlock and the wheel lock.

燧发机：火器点火系统，始于16世纪初，取代火绳机和转轮打火机转轮打火机。

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Diesels were popular in the early days because they didn't require a complicated ignition system.

柴油机流行，在早期天，因为他们并不需要一个复杂的点火系统。

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The area near an uphill incline is considered a collection point for fuel and ignition sources, and it's possible a piece of debris fell into the tinder-dry brush early Thursday and sparked the fire, Piranio said.

NPR: Cause Of California Wildfire Appears Accidental