在一些家庭中，这种义务被一种比拟隐藏的敌人给慢慢侵蚀掉了。
Some families have seen commitment eroded by a more subtle enemy.
医疗应急反应小组并不愿意在前线降落，因为只要一个隐藏的敌人发射一枚火箭弹就能轻易击落正降落中的直升机。
Although the MERT don't intentionally land during fire-fights, it would be very easy for a hidden enemy to shoot an RPG and take out the helicopter as it lands.
试试把一些食物移出你的饮食，看看感觉怎样，再慢慢把它们加回来，看看你的食谱中是不是有一个隐藏的敌人！
Try and take a few foods out to see how you feel and slowly incorporate them back in to see if there might be a hidden culprit lurking in your diet!
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