If the knocking persists after one or two fill-ups, your car may need a tune-up or some other repair.
如果把一个或两个可以飙后依然会起作用，你的车可能需要调整点火或其他一些修理。
2
Many gas stations will charge you a slightly lower rate if you pay cash instead of credit, which could add up over multiple fill-ups.
如果你付现金的话，许多加油站收的钱会稍稍比你用银行卡结算要低一些，长期积累下来也能省出不少。
3
Dozens of start-ups unveil their lovingly built sites each day, but most people already have their fill of social network profiles to update and friend requests to weigh.