"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great waveof migration.
1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”
2
Quiet, he ordered with a brisk waveof an upturned palm - I was breaking his concentration. Yes, he was in charge, alright.
他手掌向上很快挥了一下，悄无声息地发出了命令——我打断了他的注意力，是的，他确是头领。
3
Based on experimental analysis and theoretical calculation, the wave velocity field has been obtained, which is used to calculate the wave height after breaking by VOF (Volume of Fluid) method.