concept level tree  概念层次树

single-level tree  单层树

Three-Level Tree  三阶树

Three-Level Tree Classifier  多级分类

tree level  树层次

tree level coupling of bsZ  树图相互作用bsZ

Two-Level Tree Topology  两级树模型

level of fruit tree blossoms suffering frost  光谱特征

multi-level-key tree  多级密钥树

tree height level classification in photo interpretation  像片蔬级判读

LEVEL level  水平

distributions of tree-tree distances  林木最近距离分布

tree-tree  树到树

4-level frequency modulation (4-level FM)  四电平调频

bi-level programming model with two lower level models  一主多从双层规划

coupling mechanism between upper level and low level jet  高低空急流耦合

coupling of high level jet and Low level jet  高低空急流耦合

Digital Signal Level 0- Digital Signal Level 3 DS0-DS3  零阶数字信号和三阶数字信号

fiscal system at county level and township level  县乡财政体制