The parties involved should exercise (self -) restraint and prevent the situation from getting worse.

有关各方应采取克制态度，防止事态扩大。

《新英汉大辞典》

She has been saintly in her self-restraint.

她一直似圣徒般能自我克制。

《柯林斯英汉双解大词典》

She exercised all her self-restraint and kept quiet.

她好不容易才忍住没说话。

《牛津词典》

The kind of discipline and self-restraint necessary for an educated mind appears, for him, to be unequally divided among human beings.

那种受过教育者,所必备的纪律与自制，对他而言似乎是不平等地,区隔了人群。

耶鲁公开课 - 政治哲学导论课程节选

Hardly. Does it not require those qualities of self-control, discipline, and restraint necessary to achieve success here?

不！难道不需要那些特质吗,诸如自控，纪律与克制等，以求在此取得成功？

耶鲁公开课 - 政治哲学导论课程节选

Restraint or self-control is necessary for freedom or self-government.

克制与自控,是自由的必备条件或自我管理。

耶鲁公开课 - 政治哲学导论课程节选

Such self restraint would bar interventions like those in Grenada and Panama, unless the United States first gained the explicit consent of the international community acting through the Security Council or a regional organization.

CENTERFORSECURITYPOLICY: The Case Against the Halperin Nomination �� White Paper

The very word confers and bestows a kind of superior morality on the individual who has knuckled under, taken control of her often uncontrollable appetites and committed herself to a brief period of self restraint and deprivation around food.

BBC: Interactive Essay: Transcript

Or can something be done to restrain companies, or at least to get them to exercise self-restraint?

ECONOMIST: What role should corporate citizens play in politics?