Old World sandpiper with a curved bill like a curlew.东半球矶鹬,嘴巴弯曲象麻鹬.a large bull with curved horns长着弯曲犄角的大公牛The water curved round the rocks in great bursts of foam.水流撞击岩石，产生大量泡沫。The covariant equation of plane motion bod...
即使是在这种情况下,运动方程也是不能精确积分的.Even in this case the equations of motion cannot be integrated exactly.这几乎省去求解积分的一半劳动.This cuts the labor of evaluating integrals almost in half.我们可利用积分的可加性.We can use the additive property of the...
Litsea cubeba is an important export essential oil resources plant in China.精油植物山鸡椒是我国重要外销精油资源植物.Parallel evolution in Litsea and Lindera of Lauraceae.木姜子属及山胡椒属的平行演化.A method on synthesis of ionone from litsea cubeba oil...