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- And in chapter 2, we modify the general mathematical models for our model helicopter (Raptor?60), present a ground interaction model, and import a gust model and a gust disturb model based on flight mechanism analysis. 第二章在分析模型直升机飞行机理的基础上，结合raptor~(?) 60模型直升机的特点，对常规的模型直升机数学模型进行了修改，提出了地面碰撞模型，引入了阵风模型和阵风扰动模型；
- Their missile silos are below ground. 他们的导弹发射井在地下。
- Pieces of rock plummeted down the mountainside to the ground below. 岩石一块块顺著山的陡坡滚落到地面。
- He had a bruise just below his left eye. 他有个伤疤正好在他左眼的下侧。
- The fox went to ground under a rocky escarpment. 狐狸钻进了石崖下面的洞里。
- The mercury dived to ten below zero. 温度突然下降到零下10度。
- From the hill top we can see the plains below. 从山顶上我们可以看到山下的大平原。
- I thought his remarks were quite below the belt. 我觉得他的话十分尖酸刻毒。
- The ground was covered with ferns. 地面上长满了羊齿植物。
- A can like this is considered below standard. 这样的罐头认为是不合格的。
- His income is well below the average. 他的收入大大低于平均水平。
- He lifted a pail of water from the ground. 他把一桶水从地上提了起来。
- Rachel who died last week was still above ground. 雷切尔上星期去世，现在还没安葬。
- He weighed in at several pounds below the limit. 他赛前量体重比规定限度少几磅。
- This car really comes into its own on rough ground. 这辆汽车在颠簸的路上才真正显示出它独特的性能。
- They put some wreathes on the ground. 他们把一些花环放在地上。
- It require change to the setup menu as show below. 它需对安装菜单做修改，如下所示。
- The ground was ploughed and planted with corn. 地翻耕后种上了玉米。
- It was five below zero last night. 昨夜温度是零下五度。
- He takes his ground on intuition. 他的意见是凭直觉。
