4 The belayer shall leave an appropriate amount of slack in the rope at all times.
4 The belayer shall leave an appropriate amount of slack in the rope at all times.
确保员在任何时间应给予适当长度的确保绳。
4 The belayer shall leave an appropriate amount of slack in the rope at all times.
确保员在任何时间应给予适当长度的确保绳。