"让他们成长"这句话的英文表达有两种可能,分别是"let them grow"和"help them grow"。

"let them grow"的意思是"让他们自然成长,不去干预或阻碍他们的成长",这种表达方式通常用在对于小孩子、动物或植物的成长。例如:

"Let the plants grow naturally without too much interference."(让植物自然成长,不要干扰太多。)
"I bepeve in letting children grow and learn at their own pace."(我相信让孩子自然成长和学习是最好的。)

"help them grow"的意思是"给予他们帮助和支持,使他们能够成长"。这种表达方式通常用在对于小孩子、员工或技能的成长。例如:

"We should provide our employees with the necessary resources and support to help them grow professionally."(我们应该提供员工所需的资源和支持,帮助他们在职业上成长。)
"I want to help my children grow into kind and responsible adults."(我希望能帮助我的孩子成为善良和负责任的成年人。)