of up to的疑问

They travel at speeds of up to 30 knots.

这句话up to修饰30，请教老师可不可以去掉of，用up to介词短语修饰speeds？

感谢网友邀答。of 可以去掉。但不如有of 更正式。请看省略of的外刊例句：

好题 -

擅长：英语 | 采纳率 51% | 回答于 2022-08-30 12:55

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陈才 - 英语教师 2022-08-30 07:46

擅长：中考英语,词法问题

They travel at speeds of up to 30 knots.

参考译文：他们以高达30节的速度行进。

备注(1)：up to +数字表示“高达/多大” 相当于“as many as +数词” up为副词，to为介词两个一起构成副词短语修饰30 knots, up to 30 knots=as many as 30 knots

There are as many as 300 new products on show. 展出的新产品不下于300种.

备注(2)：at speeds of =at a speed of以...速度

Tidal bores can roar over the sands at speeds of 9 knots!

潮水涌浪可能会以九海里每小时的速度狂卷沙滩!

He drove at a speed of sixty miles per hour. 他以每小时60英里的速度开车.

The plane is flying at a speed of 200 miles an hour. 飞机正以每小时二百英里的速度飞行.

The train is travelling at a speed of sixty miles an hour. 火车正以每小时六十英里的速度行驶.