maximum astern speed

• 最大后退船速

maximum astern speed的用法和样例：

例句

1. They had to ease the speed of their boat.
   他们不得不减低船速。
2. Inside the opening, the wind was cut off, the sails hung limp and the ship lost speed.
   进入港湾后，风被挡住了，风帆松垂了下来，船速也减慢了。