Yellow rain is caused by pine tree pollen according to investigation of many years in Changsha.
根据对长沙黄雨的多年观测，确定黄雨是松树花粉所致。
Significantly, this line marks the southern limit of the birch tree, a plant whose pollen is one of the causes of hay fever in northern Europe.
值得注意的是，这条线标志着桦树的南部界限，而桦树的花粉是引发北欧花粉热的一个原因。
Its ability to distinguish more than 170 odours in the wild is vital for smelling nectar, pollen, water, tree resin and pheromones.
它能在野外辨别170多种气味。这种能力对闻花蜜、花粉、水、树脂和信息素的至关重要。
A kinkajou's pollen-dusted cheek tells of a late-night nectar binge in an Ochroma, or balsa, tree.
一只参加巴尔沙树午夜花蜜狂欢酒会的蜜熊，它的面颊上沾满了花粉。
By offering fly-through hospitality, the trees win the prize of a brush with a pollen-covered bee and the chance of cross-pollination with another tree.
杏树为蜜蜂提供了丰盛的食物和落脚休息之地，其回报是浑身沾满花粉的蜜蜂与花朵的亲密接触，因而得到与其他杏树异株授粉的机会。
Within the tree height, there was a trend for pollen density to increase with height.
在树高范围内，花粉浓度有由下至上增加的趋势；
The second step is to establish a series of pollen collecting stations on four transects running different directions from the source tree.
第二步是从离开夹源树四个不同方向的断面上建立一系列的花粉收集站。
The contents of protein and amino acids in pollen of tea, tea-oil tree and the mixed pollen with other plants were determined.
本文测定了茶花、油茶花和杂花粉中蛋白质和氨基酸的含量。
The contents of protein and amino acids in pollen of tea, tea-oil tree and the mixed pollen with other plants were determined.
本文测定了茶花、油茶花和杂花粉中蛋白质和氨基酸的含量。
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