Sentence examples for this is key because from inspiring English sources

This is key, because, no matter how principled we believe we are as doctors, we are only human, and the dark side of Big Pharma casts a long shadow.

Echinaforce This is key, because when you start getting ill, that's when you start looking terrible.

This is key, because Ebola spreads when a person is exhibiting symptoms.

This is key, because simply placing more ads on a page doesn't necessarily increase revenue.

This is key because it is at graduate level where we start becoming specialised and indoctrinated into the academic mindset.

This is key because the payments under the standard option might be too high for a new graduate's budget.

This constraining field is key, because without it there is nothing to hold the superheated plasma in place other than its own inward inertia.

(This was key because the light-bending effect predicted by Einstein is greatest for stars observed close to the Sun). The stars' positions relative to the Sun could be recorded and measured on photographic plates, and then compared with reference plates showing the stars when the Sun was nowhere near the field of view.

This was key because, Bart explains, "what makes the collaboration [with academics] valuable to the company is that it owns the IP".

This is key both because there is no true incentive if no one is fired, and we have children left in sub-standard environments if the ones that can't/won't improve remain in their job.

John Taysom, a fellow of the University of Cambridge and co-founder of privacy company Privitar, believes this "disassociation" is key because companies and governments get the data without a risk to privacy.