食品泡沫
参考答案：
气泡在连续的液相或含可溶性表面活性剂的半固相中形成的分散体系。
—I will go to Kunming by plane for summer vacation next week.
— . [ ]
A. It's nice of you
B. I believe you can
C. Have a great time
D. It will be difficult
有些水为什么是“咸”的？
