------
## 最终结论
```python
def insert_element(lst, elem):
    new_list = []
    for item in lst:
        new_list.append(elem)
        new_list.append(item)
    return new_list

# Test cases
assert insert_element(['Red', 'Green', 'Black'], 'c') == ['c', 'Red', 'c', 'Green', 'c', 'Black']
assert insert_element(['python', 'java'], 'program') == ['program', 'python', 'program', 'java']
assert insert_element(['happy', 'sad'], 'laugh') == ['laugh', 'happy', 'laugh', 'sad']
```