单词	bond fixation
释义	bond fixation 键固定
随便看	direct trust direct trusts direct trust tree direct tube boiler direct tube wave direct tunnel connection direct tunneling Direct tunneling current direct tunneling gate current direct tunneling phenomenon direct type recorder direct-type recorder direct-type wave direct tyre tread extruder direct ultraviolet absorbance measurement direct undertaking direct undertaking work direct underwriting direct uniformly direct union direct universal suffrage direct unloading directure directus direct usage