| 单词 | 但毫无效果 |
| 例句 | DEFINITIVE EXAMPLES 权威例句I've been trying to teach my six-year-old niece manners, but it really is hopeless.我试图教6岁的侄女礼仪，但毫无效果。剑桥国际They protested but to no avail. 他们提了抗议，但毫无效果。译典通 |
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