生物防治和化学防治最主要的区别在于，生物防治是以鸟治虫，以虫治虫和以菌治虫；化学防治是利用化学杀虫剂治害虫，两者都可以快速消灭害虫，对有害生物有杀伤力。
Basically I wrote some code to print out a triangle recursively - and originally I used an iterator in the code to take the inner parts of a triangle and include them in the complete \'picture\'.
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