In some cases, an appliance vendor-approved technician must perform the installation because it is so complex, with customers having to pay extra for this service.

某些情况下，由于安装起来太复杂，不得不请硬件工具供应商认可的技术人员来操作，这样公司为了使用该项服务还得额外多花钱。

youdao

I know that grammar is a headache of most of English learner because grammar is so complex and boring that it makes most of English learners give it up.

我知道，对于大多数英语学习者来说，语法真是令人一件头痛的事情，因为它复杂而且枯燥无味，所以很多人就放弃语法学习。

youdao

It is because they are adapted for such cultural activities - and not because of their cleverness as individuals - that human beings are able to do so many exceptionally complex and impressive things.

他们如此这般不是因为个体有多么聪明，而是由于他们溶于自己的文化氛围，而这会产生很多的文明成果。

youdao

The reason that Best Buy is so successful was because it took complex products and make them simplified for purchase at the store level with support staff much like how people come to a retail shop to buy things.

FORBES: If I Were The CEO Of Best Buy

It is an extremely complex measurement, because there are so many factors at work: shifting ocean currents, the dynamics and movement of large ice shelves, and the varying temperature and saltiness of water at different places.

WSJ: Polar Ice Sheets Melt at Faster Pace

That is what had made Best Buy so successful because it simplifies complex purchases.

FORBES: If I Were The CEO Of Best Buy