rectilinear motion的用法和樣例：
例句
- The tendency of a body in motion to continue in motion along a straight line is known as inertia.
運動物體繼續作直線運動的傾向叫慣性。 - The simplest form of wave motion consists of the combination of a transverse simple harmonic vibration and a uniform translation.
波動的最簡單形式是橫向簡諧振動和勻速直線運動的組合。
