仍处于研究和开发阶段 Seed-coating formulati
一部分候鸟在传播该种病毒方面的作用现在仍处于研究阶段。
The part of migratory birds play in spreading the virus is still being studied.
第二类技术以磁场为依托，利用共振原理，目前仍处于研究阶段。
A second technique relies on magnetic fields. It is still at an experimental stage and works using resonance.
其中，虚拟仪器虽已提出多年，但仍处于研究、讨论与试用阶段。
The virtual instrument has been mentioned for years, but it still in the stage of studying, discussing and probation.
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