1. only add to 只会
The emotional scars from such a separation would only add to an overweight kid's problems, he says.
据他分析，分离造成的情感创伤只会加重孩子的肥胖问题~NW5FUN-XL,6HJm!stmU。

2. a vested interest in 关系到……的既得利益
That gives the U.S. a vested interest in the internal affairs of other countries.
这样，其他国家的内部事务就关系到了美国的利益]BTtOekAkhg*-lsO)mr。

3. hold together 维系
If South Sudan is to hold together and prosper, it has to overcome many hurdles.
南苏丹如果要维系团结和繁荣，就要克服许多障碍lw;%TZd42*(+oI。

4. have good reasons to 有充分的理由……
The unions have good reasons not to swerve first.
工会有充分的理由不先于其他方妥协+XHt;YJ^T^enU。