face value
1 value printed or stamped on money or postage stamps 錢幣或郵票的面值; 票面價值; 票面額.
2 (idm 習語) take sth/sb at (its, his, etc) face value assume that sth/sb is genuinely what it, he, etc appears to be 假定或認為某事物[某人]真如其顯示的那樣
She seems friendly enough but I shouldn't take her at (her) face value. 她好像夠親切的, 可是我不應該信以為真.