we let in can't him

How can we let Xiao Yun wear a brown coat when she looks like a flower in this one?

晓云穿上这件大衣就像一朵花，我们怎么能让她穿上棕色大衣呢？

If new neurons are being formed every day in our brain, how can we hold onto these cells and not let them simply die away?

如果大脑中新生神经元每天都在不断形成，那我们怎样才能维持这些细胞，不让它们轻易凋亡呢？

We all have things in life which can hold us back - if we let them.

生活中充满了牵制我们的事—-如果我们让它这样的话。