Today's youth is often thought of as being overly dependent on technology.

thought 是动词 think 的过去分词形式，think 的意思是"认为、思考"。 of 是介词，表示"关于"或"属于"的关系。 as 是介词，表示"作为"或"以...的身份"。 thought of as 是一个固定短语，意思是"被认为是..."或"被视为..."，用来表达人们对某事物的普遍看法或评价。