and beyond six or seven they are worthless.
如果超过六七天，天气预报就没有了任何价值。
新概念英语第四册 Lesson 14 The Butterfly Effect

📚 句中词汇解析

从本句中提取的重要词汇

worthless ['wɝθləs] 词频3
adj. 无价值的，不值钱的;卑微的;不足取的，不足道的;不足轻重;
💡 worth价值 + less 无...的→ 无价值的，无用的
"She had been hoodwinked into buying a worthless necklace."
她受骗买了条一文不值的项链。
近义：idle, insignificant, lowly, needless, pointless, profitless 反义：helpful, immeasurable, appreciated, inappreciable, inestimable, loved
beyond [bɪ'jɑnd] 词频1
prep. 超过;越过;那一边;在…较远的一边; adv. 在远处;在更远处; n. 远处;
"The road continues beyond the village up into the hills."
那条路经过村子后又往上延伸到群山中。
近义：farther, further, off, out, outside, past
seven ['sɛvn] 词频1
num. 七;七个;第七; n. 七;七个;
"The journey took approximately seven hours."
旅程大约花了七个小时。

📚 更多「新概念英语第四册」例句

Now Alfred began a long series of skirmishes -- and within a month the Danes had surrendered.
这时，阿尔弗雷德发起一连串小规模的进攻，结果不出一个月，丹麦人就投降了。
Yet a great many processes depending on such research are sought for with complete secrecy until the stage at which patents can be taken out.
然而，依赖这种研究的很多工艺程序是在完全保密的情况下进行的，直到可以取得专利权的阶段为止。
In the contrary school, the duck is supreme.
与滑翔鸟相对的另一类鸟中，数野鸭本领最高。
and we know something of the great variety of the sea bed's topography.
而且我们对海底地形的千变万化也有了一定的了解。
that if we escape wars, accidents and diseases we shall eventually 'die of old age',
既使我们能避开战争、意外的事故和各种疾病，我们最终也会"老死；
the ocean and everything on it would be racing in to the shore with obviously catastrophic results.
那么大海和海里所有的东西就会向岸边疾涌而来，带来明显的灾难性后果。