labile protobitumen

例句：

1. 1.The labile protobitumen in the oil is prone to decomposition.
   油中的易碎原生沥青容易分解。
2. 2. The new road construction project has led to a significant increase in labile protobitumen usage.
   新的道路建设项目导致易碎原生沥青使用量显著增加。
3. 3. Due to its labile nature, labile protobitumen must be handled with care during transportation and storage.
   由于其易碎性质，在运输和储存过程中必须小心处理易碎原生沥青。