雪 ㄒㄩㄝ ˇ xuě 中 ㄓㄨㄥ zhōng 送 ㄙㄨㄥ ˋ sòng 炭 ㄊㄢ ˋ tàn lit. to send charcoal in snowy weather (idiom) fig. to provide help in sb's hour of need