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tow safety chain /ˈtəʊ ˈseɪfti ˈtʃeɪn/ n

中文：牵引安全链

中文 · 牵引安全链Español · cadena de seguridadFrançais · chaîne de sûreté
Meaning：Part of an antitheft device attached to the towing hitch, which stops anyone from hitching or unhitching the caravan.
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Travel trailer

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