由衷heartfelt;sincere;earnest;from the bottom of one’s heart
对于贵国所取得的每一点进步，我们都感到～的高兴。We heartily rejoice at every progress you’ve made.or:We hail all your achievements./表示～的感谢extend one’s heartfelt thanks/言不～not speak one’s mind;speak with one’s tongue in his cheek/～之言sincere words; words which come from the bottom of one’s heart |