四、护邮袋（crystal mount） 护邮袋是保护邮票的透明材料制品，将邮票放在里面保藏，既便于 平时观赏邮票，又可保护邮票。
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crystal-mount probe 晶体座探头
folder with crystal mount 护票卡
Forested mountains cascade down to the lake shore, the mist-covered peak of Mount Nkungwe rises up in the background and crystal-clear waters teeming with fish lap against white sand coves.
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