词汇	indomitable perseverance
释义	indomitable perseverance 百折不挠的精神
随便看	boron compound propellant boron compounds boron compounds, inorganic boron compounds, organic boron compounds, vinyl substituted boron comprehensive exploitation boron concentration boron concentration dial boron concentration measuring system boron concentration monitoring boron congeners boron constituent boron-containing alloy boron-containing concrete boron-containing gas boron-containing iron melt Boron-containing modifier boron containing phenolic resin boron-containing pig iron boron-containing polyferric silicate sulfate boroncontaining polymer boron containing polymer boron-containing polymer boron-containing shield boron-containing solid propellants