Here scientists, and science communicators, have a heavy obligation.

Senators will have a heavy obligation to do what benefits their interests.

But he said "the commanding officer had a very heavy obligation to protect his ship, his people."

He had left America, staggering under heavy obligation and set out on a pilgrimage of redemption.

I suspect not, and, if so, it has further heavy obligations to meet.

Such heavy obligations crush economic growth and deter foreign companies from investing.

But it remains under heavy obligation to collar the crooks who made off with the money, and guard the taxpayers' interest.

Both have a heavy obligation to scrutinize this case.

These are important steps in the battle for cleaner air and impose heavy obligations on an administrator who is relatively new to the job.

This return will result in France taking on heavy obligations.