A.the optical unit must be positioned so that the sun does not shine into the aperture.光學(xué)設(shè)備必須被定位以便使太陽照進光圈
B.there is are latively high rate of false accepts.有一個相對較高的錯誤接受率。
C.the iris pattern changes as a person grows older.虹膜圖案隨著一個人年齡的增長而變化。
D.concern that the laser beam may cause eye damage.關(guān)注激光束可能會導(dǎo)致眼睛損傷。