principally
adv. 主要地；大部分
例句
No new power stations have been built, principally because of the cost.
没有新建的发电站，主要是因为经费问题。
《牛津词典》
Saturated fats are fats that are found principally in meat and dairy products, although some nuts and vegetable oils also contain them.
饱和脂肪主要存在于肉类和乳制品中，不过一些坚果和植物油中也含有这些脂肪。
The book is aimed principally at beginners.
这本书主要是为初学者编写的。
