put ... in; place ... inside and leave it thereใส่ means “put” or “place,” ไว้ indicates that something is left or kept in position, and ใน means “in.” In natural sentences, the object may come before ใส่ไว้ใน, as in เอาหนังสือใส่ไว้ในกระเป๋า (“put the book in the bag”).