在未受惊扰的条件下，石鳖会把它椭圆形的身体弓起一部分以方便呼吸。
When left alone, a chiton will lift part of its oval-shaped body to breathe.
皮肤、脐部及呼吸道感染始终是主要的感染途径。
Skin, umbilicus, respiratory tract were primary route of infection.
例如，一部分负责呼吸，另一部分处理嗅觉。
For example, one part was responsible for breathing; another dealt with the sense of smell.
在参加户外活动的一部分，我们能呼吸大自然的新鲜空气。
In taking part in out-door activities we can breathe the fresh air in nature.
在参加户外活动的一部分，我们能呼吸大自然的新鲜空气。
In taking part in out-door activities we can breathe the fresh air in nature.
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