在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过15个字。

“一阴一阳之谓道”是中国古代哲学中的一个重要论断。那么①____？首先，②____，万事万物都存在这种关系，比如自然界的天地、四季、山水、风火等，都有阴阳之别。其次，阴阳两种属性尽管是对立的，③____，阳中有阴，阴中有阳。阴阳互相配合，才能化生万物。再次，阴阳是可以互相转化的，比如泰与否、损与益等，都不是一成不变的。由上所述可见，阴阳两种属性是对立统一的关系。

       A hot dog is one of the most popular American food. It was named after frankfurter, a German food. You may hear “hot dog”1in other ways. People sometimes 2“hot dog” to express pleasure(快乐). For example, a friend may ask 3 you would like to go to the cinema. You might say, “Great. I’d love to. ” Or, you could say,”4! I'd love to go.” People 5use the expression to describe someone who is a “show-off”, who tries to show everyone else how 6he is. You often hear such a(n)7called a “hot dog”. He may be a basketball player, for example, who 8the ball with one hand making a(n) 9 catch seem more difficult. You know he is a “hot dog” because when he makes such a catch, he bows(鞠躬) to crowd, hoping to10their cheers.