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The strength of the chain is in the weakest link

They dance in circles to communicate a short distance, and shake their bodies and dart back and forth to indicate a longer distance

We grew up within our family circle

Dad can blow many smoke rings

Let's make a big circle

I watched a ring of smoke that floated from his cigar into the air

A ring of smoke floated from his cigar into the air

The world's tropical rainforests are critical links in the ecological chain of life on the planet

For example, vervet monkeys learn to use a certain call in the presence of circling eagles, who prey on the monkeys