不成熟

例句：

1. 1.The young scientist is still learning the ropes of his field.
   这位年轻的科学家仍在学习他的领域的基础知识。
2. 2. The baby'sbehavior is quite unpredictable, whichmakes it difficult for him to grow up.
   婴儿的行为相当不可预测，这使他难以成长。
3. 3. Thecompany's management has beencriticized for its lack of experiencein international markets.
   该公司的管理团队因其在国际市场上缺乏经验而受到批评。