He used a double knot to ensure it wouldn't come undone.

他用了一个双结来确保它不会松开。

Old friendships might come undone and new ones will develop.

旧的友谊可能会消失，新的友谊会发展。

My shoe laces have come undone.

我的鞋带松开了。

The pins had come undone again as she spoke, and a sudden wind blew her shawl across a little brook.

她说着，别针又松了，一阵风把披肩吹过小溪。

The Second Journey is all about that…change being thrust upon one which causes a crisis of feelings during which all of our underpinnings seem to come undone.

第二趟旅程就是与改变相关的，改变强加在一个人身上时就会使他产生自己的身份认同破灭的危机感。