| 1. | The main reservoir of nitrogen is the atmosphere .
氮的主要蓄存库是大气层。 |
| 2. | Among the blue-green algae are many species of nitrogen fixation .
许多种蓝藻有固氮的能力。 |
| 3. | Mycorhizae perform the function of nitrogen fixation and storage .
菌根起着固氮和贮氮的作用。 |
| 4. | After harvesting the crops, he tested them for nitrogen content .
作物收获后，他测定了作物中氮的含量。 |
| 5. | The effect of nitrogen can be overcome by sheathing the flame in argon .
氮的影响则可以通过用氩气包覆火焰而予以克服。 |
| 6. | It is possible to harness the versatile chemical properties of cyanogen azide .
氰化叠氮的灵活多变的化学性质是可控制的。 |
| 7. | Nitrogen supply largely controls the growth and fruiting of most plants .
氮的供应密切地关系到绝大多数植物的生长与结果。 |
| 8. | This may occur in response to a high level of reduced nitrogen in the medium .
这可能是由于对培养基中高水平的还原氮的反应而发生的。 |
| 9. | Corn is one of the best indicators for nitrogen deficiency among the field-crop plants .
玉米是大多数大田作物中缺氮的最好的指示植物。 |
| 10. | Non-basic nitrogen-containing series include pyrroles, indoles, carbazoles and benzcarbazoles .
不含碱性氮的化合物包括吡咯、吲哚、咔唑和苯咔唑。 |
