Yet people who seem healthy can suffer a stroke without even knowing it.

但是，即使是看上去很健康的人也有可能在完全不知道的情况下发生中风。

youdao

This latent period lasts from weeks to months, and the host may seem healthy.

狂犬病的潜伏期从几个周到几个月不等，而且在潜伏期感染者看起来还挺健康。

youdao

But, of all the marriages in my life (friends, family, etc.) only about 50% of them seem healthy on the surface.

但是，我生活中遇到的婚姻(朋友的、家人的等等)只有大概50%能够维持健康的表象。

youdao

Yet people who seem healthy can suffer a stroke without even knowing it.

VOA: special.2009.09.22

Premiums should be distributed equally, based on the understanding that some people who seem healthy today could experience unforeseen health problems in the future.

WSJ: Should Employees Get Insurance Discounts for Completing Wellness Programs?

At a glance, it would seem like healthy competition as each of the major current players are offering an official entry into the summer box office sweepstakes.

FORBES: Can Fox And Dreamworks Combined Challenge Disney's Animation Empire?

And where they are carried out, they seem to have a healthy dampening effect on otherwise rosy interpretations of the observations.

ECONOMIST: Social science