1. The pendulum librated back and forth with precise movements.
振荡器来回摆动，运动精准。

2. The dancer librated gracefully across the stage.
舞者在舞台上优雅地舞动。

3. The bird librated in the air before landing on the branch.
鸟在空中飞翔后落在树枝上。

4. The flag librated in the wind, fluttering proudly.
旗帜在风中飘扬，高傲地飘动。

5. The boat librated gently on the calm waters of the lake.
小船在湖面平静的水中轻轻摇晃。

6. The astronaut felt weightless as he librated in space.
宇航员在太空中感到失重。