该片段反复出现单词"backbone"，并用多个例句展现其不同语境下的含义。例句涵盖了backbone作为国家、公司或个人的支柱，以及比喻人意志坚定的用法。例如，"The backbone of America"指美国的支柱，"A girl has an iron backbone"则指一个女孩意志坚定。这些例句体现了backbone一词的多样性和实用性，有助于学习者理解和记忆该单词。
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Translations:
中文 Backbone. The backbone of America. The backbone of America. We're the backbone of this country. We're the backbone of this country. Teachers are the backbone of our country. Teachers are the backbone of our country. A girl has an iron backbone. A girl has an iron backbone. The backbone of our company. The backbone of our company.