trajectory

軌道

物が動くとき、特に空中を進むときにたどる道筋。

やさしい英語で： The path something follows as it moves, especially through the air.

• The ball followed a curved trajectory.
• Wind changed the arrow’s trajectory.
• They calculated the rocket’s trajectory before launch.

使い方： the trajectory of something (We measured the trajectory of the ball.)

類義語： path, course

よく使う表現： flight trajectory, trajectory of something, change trajectory, spacecraft trajectory

軌道

変化するシステムが時間とともにたどる、一連の状態。

やさしい英語で： The series of states a changing system passes through over time.

• The model predicts the system’s trajectory.
• Different initial states produce different trajectories.
• We plotted the trajectory through phase space.

よく使う表現： system trajectory, phase trajectory, trajectory through something