| 单词 | knapsack sprayer |
| 释义 | knapsack sprayernoun A sprayer consisting of a handheld nozzle supplied from a pressurized reservoir that is carried on the back like a knapsack.Treat a circular area of 1 to 1.2 metres in diameter at the base of each tree using a knapsack sprayer, making sure to follow all instructions on the product label....
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