...前面可以加介係詞嗎?? EX. Good newspapers are mouthpieces of the nation as well as the invisible teachers of the common people. 我記得...
...ます。1. 牙周病的治療是 要去除在牙齦中的細菌並予以清潔。2. 作成護齒套(mouthpiece)。有空，請到本人的部落格參觀指正。http://tw.myblog.yahoo.com/jerrylinhome-jerrylinhome
... of a conical or cylindrical usually metal tube, a cup-shaped mouthpiece, and a flared bell organ: a keyboard instrument in which sets of ...