您要查找的是不是：
- natural cross pollination 天然异花传粉,自然异花授粉
- High in carbohydrates and vitamins A and C. Tree bears well and regularly without cross pollination. 高碳水化合物和维生素a和c熊树良好;并定期进行交叉授粉.
- The individuals of X. sorbifolia had definite differences in their phenology, which was disadvantageous to the cross pollination among the individuals, and the enhancement of pollination rate. 个体间物候有一定的差异，不利于文冠果异株授粉和授粉率的提高。
- Natural crossing varies from less than 0. 5 to about 1%. 天然杂交点自0.;5%25以下至1%25左右不等。
- The characters and inheritances of L. depressa and L. cylindrica are quite similar except fruit shape and fruit size, so it may say L. depressa is a natural cross variety of L. cylindrica. 其中台湾短丝瓜与普通丝瓜，除果实大小，长短略有差别外，其余各性状及后代遗传性状之表现大致相同，推测台湾短丝瓜可能为普通丝瓜之变种或品系间天然杂交种。
- Self-pollination and cross pollination in Strelitzia reginae Banks 鹤望兰的自花与异花授粉研究
- Four characters of protruding hair on forehead, natural crossing of 10 fingers, Thumb winding angle and dimple were investigated. 通过对人类群体美人尖、10指自然相嵌、大拇指弯曲度及酒窝4对性状的调查，并对调查结果进行了统计、分析。
- Some Sarracenia species do not take well to being self pollinated.To get good quality seed you need to cross pollinate flowers of two non-clones of the same species. 有些瓶子草的种类不适合自花授粉，想要得到好的品质的种子，你必须选择同种但是不同株(也不能是同一母株无性生殖来的)的花授粉。
- hybrid seed of GMS cottonunder natural cross conditions 天然制种
- It is natural for a cat to catch mice. 猫捉老鼠是本能。
- Cross pollinations, pollen viability, and chromosomal behavior during meiosis were analyzed to reveal the correlation between seed fertility and capsule set in Doritaenopsis hybrids. 本论文为探讨朵丽蝶兰杂交、花粉活力、减数分裂期间染色体的行为对结实及结子率的影响。
- It's natural to slack2 off towards the end of a hard day's work. 一天紧张工作快结束的时候有些放松是自然的。
- Many natural materials are becoming scarce. 许多天然原料越来越少。
- The Test of Pollen Germination and Cross Pollination in Several New Cultivars of Nashi System 砂梨系统新品种花粉发芽和授粉组合试验
- Our motherland flows with natural resources. 我们祖国蕴藏着丰富的天然资源。
- Events took their natural course. 事态依自然进程发展。
- She has a natural wave in her hair. 她的头发自然卷曲。
- Magnetism is a natural phenomenon. 磁力是一种自然现象。
- It is difficult to be natural when one is tense. 人在紧张的时候很难泰然自若。
- The egoism of an artist sometimes seem natural. 艺术家的自负有时看起来是自然的。
