nitrogen-to-phosphorus ratio

• 氮磷比

nitrogen-to-phosphorus ratio的用法和样例：

例句

1. The high rate of nitrogen and phosphorus is unfavourable to the photosynthesis of the phytoplankton.
   过高的氮磷比不利于浮游植物进行光合作用。
2. Hematocrit and serum levels of calcium and phosphorus did not differ between groups.
   而血球和血浆中的钙磷比在组与组之间并没出现不同。