- 1. there is no guarantee; one cannot say for sure; it's hard to say
- ♦ 今天~不下雨。 You can't say for sure that it won't rain today.
- 2. difficult to preserve, protect, defend, etc.
- ♦ 地位~。 One's position is untenable.
- ♦ 性命~。 One's life is in danger.
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