ball blanket是什么意思

用法例句

The characteristic of the variation of microclimate inside the single-covered and the double-covered plastic shed were studied in Changsha, and their functions and planting-effect were compared.

本试验以露地作对照，观测和分析了长沙地区单、双层覆盖塑料大棚内小气候变化规律，并对其性能和栽培效果进行了比较，以期为长沙地区设施栽培采用合理的覆盖层次，制定切实可行的调控措施，为夺取蔬菜高产、优质、高效提供依据。