Their names explain their purposes self-sufficiently.

它们的名称解释了它们的实际用途。

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Did President Obama and the Democrats simply fail to sufficiently explain to the American people how much they had done for the country?

FORBES: As Republicans Take Charge, a Look at How the House Was Won

An article in the International Journal of Obesity says that lack of exercise and an excess of junk food may not sufficiently explain our expanding waistlines.

NPR: Study Offers New Insights into Obesity

Inspectors said managers were unable to sufficiently explain why.

BBC: Maria Ball