画像引用：X ray machine Black and White Stock Photos & Images – Alamy
https://c8.alamy.com/comp/WHA908/survey-for-tuberculosis-at-a-factory-the-subject-is-placed-into-postition-against-fluorescent-screen-with-x-ray-tube-behind-x-ray-identification-card-is-in-a-slot-in-the-machine-left-the-number-on-it-will-be-recorded-on-the-chest-picture-WHA908.jpg
