threshold moisture content

例句：

1. 1.The plant's growth threshold moisture content is critical for its survival.
   植物的生长阈值含水率对其生存至关重要。
2. 2.The soil's optimal moisture content is essential for plant growth.
   土壤的最优含水率对植物生长至关重要。
3. 3. The researcher found that the plant's threshold moisture content had been exceeded in the experiment.
   研究者发现实验中的植物阈值含水率已经超出。