例句:
Picturesque by day and dazzling by night, Lake Tekapo is part of a UNESCO Dark Sky Reserve known for its clear nights and lack of light pollution, making it the perfect spot for stargazing.
1.请问 Picturesque by day and dazzling by night在句子中作什么成分?
2. adj+by day是一种什么样的用法?
谢谢!