牢不可破: be too strong to break; adamant; be indestructible [unbreakable; impregnable]; not be got rid of ...; too strong to be broken 短语和例子牢不可破的友谊 unbreakable friendship
友谊地久天长: alud lang syneauld folks at homeauld land syneauld lang syne leo sayerauld lang syueauld long synofriendship forever and everthe friend is everlasing and unchanging