这张幻灯片现在已有40多年的历史了，它的硬纸框架已变黄和弯曲，但它的影像仍然光亮清晰。
The slide is over 40 years old now, its cardboard frame browned an bent, but the image is still bright and clear.
这张幻灯片现在已有40多年的历史了，它的硬纸框架已变黄和弯曲，但它的影像仍然光亮清晰。
The slide is over 40 years old now, its cardboard frame browned an bent, but the image is still bright and clear.
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