菌根起着固氮和贮氮的作用.Mycorhizae perform the function of nitrogen fixation and storage.在生境中用带有合适菌根真菌的土壤接种.The site had been inoculated with soil containing suitable mycorrhizal fungi.大青杨VA菌根生理生态学研究.Ecological and Physiological Re...
活塞上涂了一层石墨以减小摩擦力。The pistons are graphite-coated to reduce friction.咱们用车床车[加工]新的活塞吧.Let's get the lathe to turn the new piston.他们改用活塞发动机.They use a piston engine instead....