Here I will reference some quotes from the chapter "the Unbreakable Vow" and "a Very Frosty Christmas" to examine them from the point of view that Snape is loyal to Dumbledore.

这里，我将参考“牢不可破的誓言”和“冰霜圣诞节”中的内容来证明斯内普对邓不利多的忠诚。

youdao

If you are there to protect him... severus will you swear it? Will you make the unbreakable vow?

如果你会在那儿保护他……西弗勒斯，你肯发誓么？你能立下牢不可破的誓言么？

youdao

When he tells Narcissa he will help her son, Bellatrix tests his resolve by forcing him to make the Unbreakable Vow.

当他告诉Narcissa他将帮助她的儿子，贝拉特里克斯测试他的决心，迫使他作出的牢不可破的四重奏。

youdao

Samsung claims that the displays will be nearly unbreakable.

FORBES: Samsung's Bendable Phone Could Break Apple's Innovation Hegemony

Though it appears the current lack of cohesive leadership is challenging the Lakers ability to win, it is the unbreakable culture of the Lakers organization that has historically proven that they will find success again.

FORBES: 6 Lessons the Los Angeles Lakers' Recent Hardship Can Teach Us About Leadership

Or to put it another way, the unbreakable link between credit provision and economic activity means that recessionary conditions in Spain, Italy and the weaker eurozone economies will intensify, as French and German banks take their money back.

BBC: Can Draghi do 'whatever it takes' to save euro?