safety chain
柯林斯詞典
1. N a chain on the fastening of a bracelet, watch, etc, to ensure that it cannot open enough to fall off accidentally (手鏈、手表等防止突然開口掉落的)安全鏈條 (Also called guard)
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1. N a chain on the fastening of a bracelet, watch, etc, to ensure that it cannot open enough to fall off accidentally (手鏈、手表等防止突然開口掉落的)安全鏈條 (Also called guard)