This flashcard teaches the word 'frontier,' which is a noun meaning a border, boundary, or the leading line of development. It is listed as the 4466th word in the vocabulary order.
这张卡片教授的单词是'frontier'，意为边界、国境或前沿。它是一个名词，在词汇列表中排在第4466位。
| 单词 | frontier |
|---|---|
| 发音 | ['frʌntɪə; frʌn'tɪə] |
| 释义 | n. 边界；国境；前沿 |
| 词序 | 4466 |
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