uranium

n [U] chemical element,a heavy grey radioactive metal used as a source of nuclear energy 铀. =>App 10 见附录10.

upside-down, upstage, upstairs, upstanding, upstart, upstream, upsurge, upswing, uptake, uptight, uptown, upturn, upturned, upward, upward (also upwards / -wEdz; -wLdz/), upward mobility, upward(s), upwards, upwards of, upwind, urban, urbane, urbanely, urbanity, urbanization, urbanisation, urbanize, urbanize, urbanise, urchin, Urdu, urea, ureter, urethra, urge, urge sb to do, urge sb. on, urged, urgency, urgent, urgently, uric,