A. brood /bru:d/ (on/about/over ~) = (°ÆÁ¤À̳ª ȳª´Â ÀÏÀ») µÇ¾Ã´Ù[°ö¾Ã´Ù]
= to think for a long time about things that make you sad, worried, or angry
B. at sb's beck and call = ~ÀÇ Àǵµ[Áö½Ã, ½ÃÅ°´Â]´ë·Î ÇÏ´Ù, ~°¡ ¸í·É¸¸ ÇÏ¸é ´Þ·Á°¡´Â
= be always willing and able to do whatever someone asks