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自然発生， しぜんはっせい
1. spontaneous generation, abiogenesis
2. natural occurrence, spontaneous occurrence
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火がつく， 火が付く， 火が点く， ひがつく
1. to catch fire, to be ignited, to ignite, to light (e.g. of a match)
2. to flare up (of an emotion, controversy, etc.), to blaze, to be ignited (of a dispute, commotion, etc.), to take off (of a boom, craze, etc.)
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に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
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