When pollen maturating , many small calcium precipitates distributed in its cytoplasm, especially in nucleus.接近开花时的成熟花粉粒细胞质中, 细小的钙颗粒主要分布在营养细胞和生殖细胞中....
Exports are dwindling and the trade deficit is swelling.出口在缩减，贸易赤字在增长。The number of wild animals on the earth is dwindling.地球上野生动物的数量正日渐减少.And yesterday the Zoo's fate was sealed, largely due to two months of ever-d...
The biology class studied the generation of fruit flies.生物班的学生研究了果蝇的繁殖。A lie begets a lie till they come to generation.谎言生谎言,谎言传万代。The generation of aerosols in polluted atmospheres has been investigated in several exper...
氡和钍射气的子体易被气溶胶吸附.The daughter nuclides of radon and thoron tend to become attached.锕射气氡的一种放射性的, 惰性的和气态的同位素, 其半衰期为3.A radioactive, inert, gaseous isotope of radon, with a half - life of 3.92 seconds....