1、exist
存在;實際上有
He thought that if he couldn't see something, it didn't exist.
他認為自己看不見的東西就不存在。
Research opportunities exist in a wide range of pure and applied areas of entomology.
純理論昆蟲學和應用昆蟲學的眾多領域都存在著研究機會。
（尤指在逆境中）生存，生活
I exist from one visit to the next.
我的生活就是一個接一個的訪問。
I was barely existing.
我勉強維持生計。
2、believe
相信；認為
Experts believe that the coming drought will be extensive.
專家們認為即將發生的旱災將侵襲大片地區。
I believe you have something of mine.
我想你拿了我什么東西。
相信（某人或某人的話）
He did not sound as if he believed her.
他聽起來似乎并不相信她。
Never believe anything a married man says about his wife.
永遠不要相信一個已婚男人說的任何有關他妻子的話。
認為…是應該的（或正確的）
He believed in marital fidelity.
他認為婚內應該忠誠。
decent candidates who believed in democracy.
信奉民主政治的正派候選人