stretching

例句：

1. 1. Thefabric is stretching as the material expands.
   随着材料的膨胀，布料在拉伸。
2. 2. Therope is stretched taut to hold theweight of the heavy box.
   绳子被拉紧以支撑重箱子的重量。
3. 3. The musclesin his arms are stretching as he lifts the heavy bag.
   他的手臂肌肉在提起沉重的袋子时正在拉伸。