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| 1. | a formidable opponent; the challenge was formidable; had a formidable array of compositions to his credit |
| 强大的对手；挑战是强大的；值得表扬的优秀结构安排；归总理支配的强大智囊团。 |
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| 2. | A formidable challenge;a formidable opponent. |
| 难以应付的挑战；难以对付的对手 |
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| 3. | formidable challenge |
| 艰巨的挑战 |
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| 4. | However, the complex and unique nature of HIV has presented a formidable challenge to developing an |
| 但是，艾滋病毒复杂而独特的性质，给研制有效的疫苗提出了艰巨的挑战。 |
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