Ichnofossil
[地質]足跡化石, 蹤跡化石
??? 情景例句
His excuse sounds unconvincing.
他說的理由好像不可難。
I'm afraid all my efforts were in vain.
我擔心我的努力全白費了。
Where did you put the oranges?
你把橘子放在哪了？