棘轮套筒扳手
/ˈɹatʃɪt ˈbɒks ˈɛnd ˈɹɛntʃ/
n
English: ratchet socket wrench · 棘轮套筒扳手
释义：Wrench fitted with a pawl and a ratchet: the pawl sets the direction of rotation, while the ratchet lets the handle turn in the opposite direction over the socket.