Under normal conditions, rocks composed of clay produce far less friction than do other rock types.
在正常情况下,由粘土组成的岩石产生的摩擦要比其他类型的岩石小得多。
Creative ideas not only produce their own instruments of survival as time and circumstances demand, but permit the substitution of new forms for old under the pressure of changed circumstances.
创造性的思想不仅随着时间和环境的需要产生自己的生存工具,而且允许在已变化环境的压力下用新的形式代替旧的形式。
One site alone, the Pentland Firth, between Orkney and mainland Scotland, could produce 10% of the country's electricity with banks of turbines under the sea.
单是位于奥克尼和苏格兰大陆之间的彭特兰湾发电站,就可以利用海底涡轮机产生10%的全国发电量。
But these slow-wilting lines, he says, produce 4 to 8 bushels more than normal soybeans under drought conditions.
VOA: special.2009.01.20
So, how could you produce--the question is, how could you produce large quantities of this- of this microorganism, this virus vaccinia under controlled conditions?
问题是该怎么进行生产,你怎么大批量生产这种微生物,即在可控条件下生产牛痘病毒
But these slow-wilting lines, he says,produce four to eight bushels more than normal soybeans under drought conditions.
VOA: special.2009.03.23
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