treeline

Massive tractors and bulldozers are ripping into the treeline, toppling the huge trees.

巨型拖拉机和推土机正在切割树木线，巨大的树木被放倒。

Vegetation lines the slopes at lower elevations, but much of the land in this image lies above the treeline.

植被沿着山坡较低处生长，然而图中的大部分陆地位于林线以上。