Because the oil is used as a reserve nutrient—like fat—diatoms have evolved no mechanism to secrete it.

由于油的作用是营养储备——就象脂肪似的——所以硅藻没有进化出分泌油份的机制。

youdao

Because the oil is used as a reserve nutrient—like fat—diatoms have evolved no mechanism to secrete it.

由于油的作用是营养储备——就象脂肪似的——所以硅藻没有进化出分泌油份的机制。

youdao