| 词汇 | arduous |
| 词根词缀 | 词源： 1530s, "high, steep, difficult to climb," from L. arduus "high, steep," from PIE base *eredh- "to grow, high" (see ortho-). Metaphoric extension to "difficult" first attested 1713. 词根记忆： a. 劳累的[ardu=difficult(困难)] 词根词缀： arduousarduous a 劳累的 ardu=difficult (困难) arduous a 劳累的 |
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