“safe” and “secure” 의 차이는 뭘까

BMO은행의 소개 자료를 읽다보니, 'safe and secure' 라는 표현을 보게 되었다.

safe는 안전이고, secure도 안전으로 알고 있는데 뭔가 차이가 있는듯 싶어 찾아보게 되었다.

1. The birds' nests are high up, safe/secure from predators.
2. These elephants are relatively secure/safe from poachers.
3. Make sure you keep these documents safe/secure.
4. Keep your credit cards in a safe/secure place.
5. I always feel safe/secure when I'm around my big dog.

정답은

1. The birds' nests are high up, safe from predators.

2. These elephants are relatively safe from poachers.

3. Make sure you keep these documents secure.

4. Keep your credit cards in a secure place.

5. I always feel safe when I'm around my big dog. (If you bought the big dog to make yourself feel secure, then I could also see using secure in this sentence.)