#petrified #greece #wilson #tree #problem

Greece's 20 million year old petrified tree

Name: Greece's 20 million year old petrified tree
Uploaded: 2021-01-28T23:45:35.000Z
Duration: 51 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

林宜悉 posted on 2021/01/28

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problem

US /ˈprɑbləm/

・

UK /ˈprɒbləm/

Noun (Countable/Uncountable)
Something difficult to deal with or causes trouble
Question to show understanding of a math concept

Adjective
Causing trouble

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