设备空投主要有三种方法。
Three primary methods of aerial delivery are used for equipment or supplies.
成本估算主要有三种方法：专家判定法、类比法、参数模型法。
There are three main methods of cost estimation: expert method, analog method and parameters model method.
当前对网络性能分析主要有三种方法：分析方法、实验分法、模拟方法。
At present, there are mainly three kinds of methods to analyze the performance of the network: Analytical method, experimental method, and simulation method.
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