每日日夕扣齿各60次，可健齿防牙病和牙齿零落等。

Daily Rixi buckle teeth 60 times each, can prevent dental teeth and tooth loss.

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阻生齿很难保持清洁，这往往造成蛀牙和牙龈病的发病率增加。

Crooked teeth are more difficult to keep clean. This usually results in a greater incidence of tooth decay and gum diseases.

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一种北美落叶树(美洲榆)，有双齿叶和双翼果，主要作为观赏性浓荫树，但常患荷兰榆树病而坏死。

A North American deciduous tree (Ulmus Americana) having double serrate leaves and winged fruits. It is grown chiefly as an ornamental shade tree but often dies from Dutch elm disease.

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