to tip的用法和样例：
例句
- Some young people these days do not wish even to tip their hats to the opinions of their parents.
现在有些年轻人甚至连自己父母的意见都不愿表示尊重。 - It would be difficult to tip the political scales so late in the campaign.
竞选已进行到这么晚的阶段，要想扭转政局是很难办的。 - Is it customary to tip waiters in your country?
在贵国依照惯例是否应该付给服务员小费? - Did you remember to tip the porter?
你记得给搬运工小费了吗？
