1.a segment of the trunk of a tree when stripped of branches
2.large log at the back of a hearth fire
3.the exponent required to produce a given number
4.a written record of messages sent or received;
they kept a log of all transmission by the radio station
5.a written record of events on a voyage (of a ship or plane)
6.measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water
1.enter into a log, as on ships and planes
2.cut lumber, as in woods and forests
英语名词:logarithms。如果a^b=n,那么log(a)(n)=b。其中,a叫做“底数”,n叫做“真数”,b叫做“以a为底的n的对数”。 log(a)(n)函数叫做对数函数。对数函数中n的定义域是n>0,零和负数没有对数;a的定义域是a>0且a≠1。