light air-transportable tracked vehicle

例句：

1. 1. The dress is very light and easy to wear.
   这件衣服非常轻薄，穿着很舒服。
2. 2. The baby is so light that it can float in the air.
   这个婴儿太轻了，可以在空中漂浮。
3. 3. Light travels faster than sound.
   光比声音传播得更快。