Generally, trimming a eucalypt is only done to young trees to shape them. In that case, you would trim to an outward facing side shoot. Lower branches can also be removed. In older trees, pruning should only be done if necessary, and branches removed flush with the trunk. Some species can be rejuvenated completely by coppicing, or cutting right down to a stump. Only species with a lignotuber will regrow, so check first.
Your English is incorrect, should read, "How do you prune an olive tree?"
During the Winter.
Most types of Eucalypyus will sprout new foliage even if cut to ground.
prune them
A Eucalyptus tree is exactly the same as a Gum tree.
Eucalyptus is a tree.
eucalyptus tree juice
The gum tree is mostly native to Australia. Yes, there is another name for the gum tree; it is Eucalyptus.
eucalyptus cinerea(small tree) and Eucalyptus globulus(big tree)
The Eucalyptus tree for one produces eucalyptus oil.
A koala on a eucalyptus tree does not affect the oxygen.
Leaves on a eucalyptus tree point downwards.