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Volunteers Keep Hands-On Science Alive in US Classrooms When it comes to making science fun, Lisa Purcell is a pro. Mimicking an owl or a foraging squirrel is all in a day's work for the director of the Four Winds Nature Institute. On this particular

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学英语单词

A. L. I.

Abou Moûssa, Nahr

acrylic abutment

air cleaner and silencer

alkali resisting cellulose

aluminum soap-carbon black thickened grease

Anoeta

auto theft

availability of equipment

Bacillury

balls