Xtr
[計]= eXTRa,[修]特別的，額外的，附加的
??? 情景例句
Stay on that road, and you'll cross a blue bridge.
沿著路開下去 ，你會經過一座藍色的橋。
How many gallons are you going to take?
你要拿幾加侖？
Nobody! She taught herself.
沒有人（教）！她是自學的。