This is principally because the major export markets are slowing.

这最主要是因为主要出口市场越来越不景气。

《柯林斯英汉双解大词典》

It is principally during this period of stronger governance that CEO pay has been high and rising.

主要是在这段加强治理的时期，首席执行官的薪酬一直居高不下并不断上升。

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Nitrogen in coals is principally of organic nature.

研究表明：煤中氮主要以有机形态赋存；

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That potential difference is generated by the movement of ions, principally sodium and potassium across the membrane.

电势差是由离子运动造成的,特别是钠和钾的跨膜运动

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That is principally because economic uncertainty in South Korea has had a knock-on effect in Sri Lanka.

BBC: South Asia: Rupee down

Indeed, the vote is principally the product of two major mistakes committed by Clinton and his senior advisers.

CENTERFORSECURITYPOLICY: Center for Security Policy | Fumble on the Test Ban Treaty By Richard Burt The Washington Post, 18 October 1999

Since the sites being measured are all U.S.-based, the score is principally a sign of what Americans are talking about.

FORBES: Magazine Article