permanent nurseries

例句：

1. 1. The company's commitment to environmental sustainability is a permanent fixture in its operations.
   公司对环境可持续性的承诺是其运营中的一个永久特征。
2. 2. The river flows through the city, marking the permanent presence of nature in urban landscapes.
   这条河流穿过城市，标志着自然在城市景观中的永久性存在。
3. 3. The decision to build a new bridge was made permanent with the construction of the new road.
   建造新路的决定被永久性地确定了。