crust/krʌst; krʌst/n [C,U] 1 the baked outside part of bread, a PIE , etc 面包皮﹔〔馅饼等的〕酥皮 2 a hard layer on the surface of something 硬的外层: the Earth's crust 地壳
crustcrustcrustscrustedcrustingnounthe hard part on the outside of bread▶ crustycrustycrustiescrustiercrustiestadjectivewith a hard crust: fresh crusty bread