如果同卵双胞胎彼此在疾病方面比异卵双胞胎更相似，那么这种疾病的易感性至少在一定程度上是由遗传造成的。
If identical twins are more similar to each other with respect to an ailment than fraternal twins are, then vulnerability to the disease must be rooted at least in part in heredity.
蚂蚁从花朵中收获花粉时并不能保证一定可以产生异花授粉的效果：蚂蚁会爬到地面或其他植株上。
Cross-pollination isn't ensured when an ant picks up pollen off a pancake plant: The ant may then crawl to the ground or another species.
总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。
Except for some differences in exine ornamentation and pollen size, there is no great evolutionary divergence among genera in pollen morphology.
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