join up
US /dʒɔɪn ʌp/
UK /dʒɔɪn ʌp/
1.
加入, 参加
to become a member of an organization, club, or group
:
•
He decided to join up with the local environmental group.
他决定加入当地的环保组织。
•
Many young people join up for various social causes.
许多年轻人加入各种社会事业。
2.
参军, 入伍
to join the armed forces
:
•
He decided to join up right after high school.
他决定高中毕业后立即参军。
•
Many young men were encouraged to join up during the war.
战争期间，许多年轻人被鼓励参军。