你不屈服于压力，只服从原则。

You don't <em>yield</em> <em>to</em> <em>pressure</em>, only to principle.

但上海男人从不气馁，因为他从不屈服于压力。

But a Shanghai man is never discouraged, as pressure can never repel him.

也门的萨利赫和叙利亚的阿萨德会受到挑战甚至屈服于压力。

Saleh of Yemen and Assad of Syria would be either challenged or already on their knees.