给轮胎打气。
Pump the tire up hard before going out on the road.
在出去上路之前， 要把轮胎打足气。
What is the most efficient way to pump your bicycle tire?
给自行车轮胎打气的最有效率的方法是什么？
A tire expands when you pump air into it.
轮胎打了气就会胀大。
Pump the tire up hard before going out on the road.
在出去上路之前，要把轮胎打足气。
Pump the tire up hard before going out on the road.
在出去上路之前，要把轮胎打足气。
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