swing stem

例句：

1. 1.The tree's swaying stem was a symbol of the wind's power.
   那棵树摇摆的茎象征着风的力量。
2. 2. The scientist used a swaying stem to measure the plant's growth rate.
   科学家用一个摇摆的茎来测量植物的生长速率。
3. 3.The artist painted a swaying stem in the center of the canvas.
   艺术家在画布中央画了一个摆动的茎。