1. How to comprehend the "precipitation"? Uncountable? Plural form? Why is it followed by "collect" rather than "collects"? 2.What are called rills and gullies? Precipitation or small valleys?
1。这是定语从句 mountainous regions collect in a number of small valleys 2。Precipitation in mountainous regions are called rills and gullies. Precipitation被称为rills and gullies
No, I don't think this way. The pdf version misses out underlining the fisrt "that", so it should be :
84. Precipitation in mountainous regions (that collects) in a number of small valleys that are called rills and gullies. Precipitation collects in....... Not "regions collect".