保守派中意几乎零二氧化碳排放的核能，而效果未知的CCS是为了获得煤炭大州的支持。
Near-zero-carbon nuclear power is popular with conservatives, while unproven CCS is meant to seduce the many coal states.
在什么年龄开始学第二门语言才能够产生推迟痴呆症的效果也是未知的。
The age at which the second language needs to be acquired to yield the protective effect is also unknown.
然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。
This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.
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