young blood
a young energetic person that brings new ideas, enthusiasm, and vitality to a group, organization, or activity

年轻的血液, 新鲜力量

[名词]
at one's mother's knee
used when someone has learned or experienced something from a very young age
[短语]
salad days
the time in a person's life marked by youthfulness, inexperience, and being carefree

沙拉日, 青春岁月

[名词]
(as) old as the hills
used to describe someone or something that is old and has existed for a long time
[短语]
long in the tooth
describing an individual who has lived for a very long time and is not able to do certain activities due to old age
[短语]
old enough to be one's mother
used to refer to a significant age difference between two people, especially those who are romantically involved with one another
[短语]

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