各要素を2倍した新しいリストを作るには、リスト内包を使う：
```python
my_list = [1, 2, 3, 4, 5]
new_list = [2 * x for x in my_list]
print(new_list) # prints [2, 4, 6, 8, 10]
```
To create a new list with each element multiplied by two, you can use list comprehension:
```python
my_list = [1, 2, 3, 4, 5]
new_list = [2 * x for x in my_list]
print(new_list) # prints [2, 4, 6, 8, 10]
```