is the only city in China which is on the sea.这是is the only city in China which is on the sea.这是中国唯一的海上城市.这个句子对吗?

问题描述:

is the only city in China which is on the sea.这是
is the only city in China which is on the sea.
这是中国唯一的海上城市.
这个句子对吗?