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Another payload is the high-performance propellant, developed by the US Air Force Research Laboratory. The "green" and more effective fuel can be an alternative to hydrazine, the highly toxic fuel, according to NASA.

Another challenge is the difficulties in dealing with the complicated medical terms, Yang said.

Apolong can complete driverless operations such as obstacle avoidance, swerving and automatic transshipment. The bus will initially be put to use in last-mile travel scenarios in tourist spots, airports and other enclosed areas.

Another way to avoid “Day 2”: don’t get lazy about learning. Wilke said Amazon’s newest leadership principle — “Learn and Be Curious” — is all about how to avoid complacency after achieving success.

Another forum on engineering management in smart city development will be held on the sidelines of the expo.