那时他们就结下了牢不可破的友谊。
They had formed a friendship at that time which was never to be broken.
理解自己，理解他人，用理解这凝合剂把心和心连在一起，结成牢不可破的友谊。
Understand yourself and others and then link the hearts with the understanding, a glutinous reagent, to form an unshakable friendship.
中国网友甚至造出“巴铁”这个术语，用以形容中国和巴基斯坦之间牢不可破的友谊。
Chinese netizens even coined the term "Iron Pak" to refer to the unbreakable ties between China and Pakistan.
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