Definition: not physically strong Level: B1
如果你饮食不当，可能会感到虚弱。
If you haven't eaten properly, you might feel ___weak.
流感过后，我感到如此虚弱，以至于无法做任何家务。
After the flu, I felt so ___weak that I couldn't do any chores.
长跑后，他的腿很虚弱。
His legs were ___weak after the long run.
