This sudden outbreak

突如其来───come unexpectedly;疫情───epidemic situation

There are three things that come unexpectedly -marriage, birth and death.───有三样事来得突然：结婚，出生和死亡。

If negativity does happen, it will probably come unexpectedly.───如果否定性发生，它将意想不到地大概来。

A lot of things is often come unexpectedly the kill you didn't give you a chance to recuperate.───很多事情往往就是突如其来的把你毙了根本没有给你喘息的机会。

You seem to feel was that come unexpectedly dark terrors, body couldn't help shaking.───你觉得自己似乎被这突如其来的黑暗所惊吓，身体忍不住振颤了一下。

Beautiful dreams, much like nice poems, come unexpectedly in a very moment without any design or interventions .───美丽的梦和美丽的诗一样，都是可遇而不可求的，常常在最没能料到的时刻里出现。

Don't take these experiences seriously because suffering and happiness just are impermanent, they go and come unexpectedly.───不要把这些体验看得太认真，要知道苦与乐来来去去，变幻不定。

He was saying in plain terms that markets trend, and those trends come unexpectedly.