He took a short lengthof rope and swiftly tied a slip knot.
他拿了一小段绳子迅速打了个活结。
《柯林斯英汉双解大词典》
2
But when I found myself on the ground, I speedily untied the knot, and had scarcely done so, when the roc, having taken up a serpent of a monstrous length in her bill, flew away.