时差也使我感到很虚弱。
我感到很虚弱，因为我没有勇气告诉我的朋友，我其实不想花这么多钱。
I felt weak because I didn't have the grit to tell my friends I didn't want to spend that much money.
在提到一次长距离跑步之后的那几天，他说：“那几天，我感到很虚弱，心率也一直徘徊在40-42，而我平时的心率是48-52。
My heart rate is normally 48-52, and it goes down to 40-42 for a few days – I certainly feel more tired.
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