We must solve these problems left over from the past thoroughly.
对过去遗留的问题，应当解决好。
To solve these problems, the whole world must work together and with resolution.
为了解决这些问题，世界人民必须携起手，果敢地面对处理。
Doing these things will ensure that your problems remain unsolved. And, if you are asking others to solve their problems, they must first see you solving your own.
严责自己或原谅自己的缺点只会确保你的问题不被解决，而如果你要求他人解决他们的问题，他们一定会先看见你解决自己的问题。
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