off-the-shelf|现成的；常备的；成品的 fingerprint|指纹；手印['fɪŋgəprɪnt] imperil|危及；使陷于危险[ɪm'perɪl; -r(ə)l] iris|虹膜；鸢尾属植物['aɪrɪs] megapixel|兆象素['meɡəpɪksəl] acrylic|丙烯酸的[ə'krɪlɪk] emulsion|乳剂[ɪ'mʌlʃ(ə)n]