X-ray absorbing glass
document in a sheet of paper which is used to pay taxes or other types of payment.
glass (having a high lead content) that resists the penetration of X-rays and gamma rays
plural of combat boot
A knot in wood; a large or hard knot, or a protuberance with twisted grain, on a tree. / Something resembling a knot in wood, such as in stone or limbs.
病院は放射線科に散乱放射線から職員を守るために、厚い鉛入りの放射線遮へいガラス板を設置した。
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