I wouldn't count on it. 我不会寄予期望的。
"count on" 是信赖，仰仗之意。如果不想对方对某事抱有太大希望，就可以用这个句型。
1. If I were you, I wouldn't count on it.
2. You can't count on the weather being fine.
3. You can't count on Harry in any emergency.
A: I hope the teacher decides to curve our test grades.
B: I wouldn't count on it.
A: She did last time.
B: Yes, but I'll bet she won't again.