For the girls, nature study was an occasion for lazy walks and idle picnics.对姑娘们来说，博物课是一次懒散地漫步和野餐的机会。For the girls, nature study was an occasion for lazy walks.对女孩子而言，自然课是可以慵懒地散步的机会。They drove into the mountains for a weekend of nature study.他们周末开车进山去观察自然。