highway heavy maintenance 公路大修
heavy-duty maintenance machinery 大型养路机械
Helicopters are expensive and delicate machines requiring heavy maintenance, especially when flying in dusty conditions.
直升机是昂贵而易损的机器，需要精心保养，尤其是在尘土飞扬的条件下飞行时。
If you're not doing heavy up-front development or committing to years of maintenance on each feature, you can easily try out different things.
只要你没有进行大批量的前期开发，或是承诺在特性上维护多年，你就能随意尝试不同的东西。
By the 19th century, the canal fell into disrepair thanks to neglected maintenance, a major flood, and heavy pollution.
到19世纪，由于疏于维护，大洪涝和污染严重，大运河的命运陷入塌毁的境地。
应用推荐