单词:calcium soil
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By Gary Garriott Broadcast: July 29, 2003 This is Bill White with the VOA Special English Agriculture Report. Soil conservation efforts protect soil from wind and water that can blow or wash it away.
AGRICULTURE REPORT - Legumes: Good for People and SoilBy Bob Bowen Broadcast: Tuesday, February 21, 2006 I'm Steve Ember with the VOA Special English Agriculture Report. Many different kinds of plants
By Mario Ritter Broadcast: August 25, 2003 This is Bill White with the VOA Special English Agriculture Report. Plant scientists consider them fruit. Most other people think of them as vegetables. What
Mars Rover to Begin Taking Soil Samples This Week Jessica Berman NASA engineers say the Mars rover will begin taking its first soil samples as soon as it departs the landing platform . Engineers say t
Calcium 钙 Calcium is a kind of mineral. 钙是一种矿物. It is found in rocks, sea water and soil. 它常见于岩石、海水和土壤中。 Calcium is important for human health. 钙对人体健康很重要。 Then do we have to eat rocks or s
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