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....
There are many kinds of hoes.锄头有很多种.The farmers counted their rakes and hoes and plows.农民清点耙,锄和犁.I saw Xiao Yang walking by , shouldering two hoes.我看到小扬扛着两把锄头从旁走过.Every day, he hoes her small flower garden.他每天都在小花园里锄地....