Collecting matchsticks was fun, until that fateful day one of them caught alight.
收集火柴是一种乐趣,除非一天其中一根火柴不幸燃烧起来。
Bison waste no longer fell on the ground to improve the soil, which as a result became less good for growing plants.
地上不再有野牛的粪便来改良土壤,结果对于植物生长土壤变得不够肥沃了。