VOA慢速英语:希腊科学家发现了一棵两千万年前的树

fossil – n. a trace or print or the remains of a plant or animal of a past age preserved in earth or rock : fossilized – adj. having been changed into a fossil

petrified – adj. used to describe something (such as wood) that has slowly changed into stone or a substance like stone over a very long period of time

branch – n. a part of a tree that grows out from the trunk

unique – adj. very special or unusual

preserved – v. to keep alive, intact, or free from decay

lava – n. molten rock that issues from a volcano or from a fissure in the surface of a planet (such as earth) or moon

eruption – n. the bursting out of material from a volcano

subtropical – adj. of, relating to, or being the regions bordering on the tropical zone