送交者: 湘女 于 2010-01-16, 22:52:46:

回答: The moral of the story: chew a gum when you go out. 由 Eiin 于 2010-01-16, 22:46:05:

• 这也许是个科普话题：咀嚼和唾液的产生 (无内容) - Eiin (0 bytes) 2010-01-16, 22:56:25 (405092)

加跟贴