You need a slope angle and you need snow on it and then we need a trigger.

需要有坡度，有雪，然后需要一个“触发器”。

Or you can dig up the top layer of the soil to decrease the slope angle.

或者您可以挖掉表层土壤以减小坡度角度。

Not just the slope angle or the amount of new rain, but the type of soil, the minerals present, and the vegetation growing on top of the slope.

不仅仅是斜坡角度或新降雨量，还有土壤类型、存在的矿物质以及斜坡顶部生长的植被。

One spring in the mating season two pairs were fluttering in the palm tree by my gate. The long grooved stems of the large palm fronds leave the trunk at a downward sloping angle.

在交配季节的一个春天，两对在我家门口的棕榈树上飞舞。大棕榈叶的长凹槽茎以向下倾斜的角度离开树干。