词汇	劳心诵读
释义	劳心诵读医overstrain of the heart for reading
随便看	negative-grid oscillator negative-grid superhigh frequency tube negative grid super high frequency tube negative-grid super high frequency tube negative grid thyratron negative-grid thyratron negative grid tube negative-grid tube negative grid voltage negative ground negative grounded DC two-wire system negative grounded d.c.two-wire system negativegroup negative group negative grouping negative group velocity negative group veloci.ty Negative Group Velocity Dispersion Mirror negative heat of solution negative heliographic paper negative heliotropism negative hemipyramid negative hero negative heteropycnosis negative heteropyenosis