first (second) order approximation

• 一阶（二阶）逼近

英英释义

名词 first:

1. the first or highest in an ordering or series

2. the first element in a countable series

3. the time at which something is supposed to begin

4. the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)

5. an honours degree of the highest class

6. the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving

形容词 first:

1. preceding all others in time or space or degree

2. indicating the beginning unit in a series

3. serving to set in motion

4. serving to begin

5. ranking above all others

6. highest in pitch or chief among parts or voices or instruments or orchestra sections

副词 first:

1. before anything else

2. the initial time

3. before another in time, space, or importance

4. prominently forward