Ｔhe mechanisms at work are manifest in the tendency for such physical activity to utilize the potentially harmful constituents of the stress response.3 T! i. [" W' M# l
- Z! J  m6 o9 _3 `+ O0 Y' i8 L
小妹先谢过了.

主句就是：the mechanisms are manifest: f6 x' x' w+ V, j' y  I3 m

4 J  p1 J- P  L  R  Min the tendency..... 是状语吧; _2 \9 a: v7 s4 e# O, K

# X6 m( ^) n, o: ^$ h利用压力反应潜在的危害要素的这种物理行为明白的解释了机械装置的工作。