单词：perennial rye-grass
perennial rye-grass的用法和样例：
例句
- Perennial ryegrass throws a lot of autumn growth.多年生黑麦草在秋季长势很好。
- Ammonia volatilization was estimated in the field from perennial ryegrass turf after application of five kinds of N-fertilizer.在多年生黑麦草草坪施用速效与缓效氮肥后，对氨的挥发损失进行田间定位测定。
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