The disadvantage is that such equipment will be extremely expensive.

缺点是这种设备将非常昂贵。

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Houses in the neighbourhood of Paris are extremely expensive.

巴黎附近一带的住房极其昂贵。

《牛津词典》

Hiring the wrong person (s) is extremely expensive.

聘请了错误的人会付出极其昂贵的代价。

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And getting the level of immediate support needed for security issues is extremely expensive.

FORBES: Microsoft Software Assurance: Insurance? Or Extortion?

Such forces will, moreover, likely prove extremely expensive when compared with the benefits provided.

CENTERFORSECURITYPOLICY: Center for Security Policy | An Assessment Of Future Requirements For US Strategic Forces And Strategic Arms Control

Home dialysis was fairly common in the 1960s, when the treatment was new and extremely expensive.

FORBES: Magazine Article