Seeds and pollen are spread by the wind.
种子和花粉是随风传播的。
As the day goes on, the pollen dries up and becomes hard.
随着日子一天天过去，花粉变得又干又硬。
Avoid trips to the country while the pollen count is high.
花粉计数高时，尽量避免去乡村旅行。
Many people are allergic to airborne pollutants such as pollen.
许多人对空气中花粉之类的污染物质过敏。
Flowers are designed to attract insects which then carry the pollen from plant to plant.
花儿天生就能吸引昆虫，昆虫则在植物之间传递花粉。
The air is pure, with neither pollution nor pollen.
空气纯净，没有污染也没有花粉。
He has captured pollen from alder, pine, and willow.
他从桤树、松树和柳树上捕捉到了花粉。
He has also captured pollen from alder, pine and willow.
他还从桤树、松树和柳树上采集了花粉。
The insecticide occurs throughout the plant, including its pollen.
这种杀虫剂存在于整个植物中，包括它的花粉。
Then there is fossilized pollen, from low shrubs and grasses that once grew in the Sahara.
还有一些石化的花粉，来自于曾经生长在撒哈拉的小灌木丛和草丛。
Another problematic method is to reconstruct former climates on the basis of pollen profiles.
另一种有问题的方法是根据花粉谱重建以前的气候。
Change the filters on your air-conditioning vents. These filters are dust and pollen "magnets".
更换空调通风口的过滤器。这些过滤器是灰尘和花粉的“吸铁石”。
Maize pollen is dispersed by the wind and often blows onto milkweed plants that grow near maize fields.
玉米花粉被风吹散，经常吹到生长在玉米田附近的乳草属植物上。
The pollen can then be separated from the rest of the catkin by sieving through cheesecloth or fine screen.
以粗纱布或细筛过筛，便可将花粉同柔荑花序的其它部分分开。
The problem occurs because plants need to transfer pollen by wind and insect to fertilization and reproduction.
这个问题的出现是因为植物需要通过风和昆虫来传递花粉以受精和繁殖。
When, in experiments, these caterpillars were fed milkweed leaves dusted with pollen from modified maize plants, they died.
在实验中，这些毛毛虫被喂食沾有转基因玉米花粉的马利筋叶子，然后它们死亡了。
The type of vegetation in a specific region is determined by identifying and counting the various pollen grains found there.
一个特定地区的植被类型是通过识别和计算那里发现的各种花粉粒来确定的。
The male cone of Cycas circinalis, for example, sheds almost 100 cubic centimeters of pollen, most of which is probably dispersed by wind.
例如，苏铁的雄性圆锥体会脱落近100立方厘米的花粉，其中大部分可能是被风吹散的。
A midge gathers pollen from a cacao flower by sticking its head inside a "petal pouch" that contains both pollen and a sticky nectar reward.
一只摇蚊把它的头伸进一个“花瓣囊”里，收集可可花的花粉，“花瓣囊”里既有花粉，也有粘稠的花蜜。
The allergen in jackfruit does not sensitize the immune system, but once birch pollen has done so, the immune system may react to jackfruit too.
菠萝蜜中的过敏原不会使免疫系统敏感，但是一旦桦树花粉刺激了免疫系统，免疫系统也会对菠萝蜜有反应。
The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds of which are released from some of the larger cones.
苏铁雄球果的结构与花粉的风传播相当一致，花粉云从一些较大的球果中释放出来。
Anyway, it's this fossilized pollen along with the aquifers and the rock paintings, these three things are all evidence that the Sahara was once much greener than it is today.
总之，这些花粉化石，还有含水层和岩画，这三样东西都证明了撒哈拉沙漠曾经比现在绿得多。
Certain varieties cannot be fertilized with their own pollen.
某些品种不能自花授粉。
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