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
英語名詞:logarithms。如果a^b=n,那么log(a)(n)=b。其中,a叫做“底數”,n叫做“真數”,b叫做“以a為底的n的對數”。 log(a)(n)函數叫做對數函數。對數函數中n的定義域是n>0,零和負數沒有對數;a的定義域是a>0且a≠1。