名词
中文翻译：折叠裂缝
同义词：
['fold line', 'folding crease', 'folding line', 'folding ridge例句：1. The old book had a fold crack in the spine.（那本旧书脊上有一道折痕。）']
例句：
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1. The old book had a fold crack in the spine.
那本旧书脊上有一道折痕。
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2.The car's body was covered with fold cracks from years of use.
这辆车的车体布满了多年的使用痕迹。
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3.The engineer carefully folded the metal sheet to avoid any fold cracks.
工程师小心地折叠金属板，以避免任何折痕。