well up in

精通，熟悉，长于

weightily, weightiness, weighting, weightless, weightlessness, weighty, weir, weird, weirdly, weirdness, weirdo, welcome, welcome to, weld, welder, welfare, welfare state, welfare work, well, Well Tempered Clavichord, well-advised, well-aimed, well-appointed, well-balanced, well-being, well-born, well-bred, well-built, well-connected, well-defined, well-disposed, well-done, well-dressed, well-educated, well-established, well-fed, well-founded, well-groomed, well-head (also `well-spring), well-heeled,