未知数

There is greater transparency in Latin American economic decision-making, but Brazil is the region's wild card.

拉丁美洲各国的经济政策有较大的透明度，巴西却是这个地区的未知数。

A: The advertisement is still a wild card.

这个广告的成功与否还是个未知数。

He's got a sporting chance of passing his exams.

他能否通过考试还是未知数。

This compares with a latency of less than one cycle for additions and subtractions (which can be executed in parallel).

如果被除数是一个未知数的话，那么编译器就只好使用DIV指令了。

The so-called idle land in the end how much I did not study, but the examples: Shijiazhuang figures reported in 2008 to build capacity at up to 45 million square meters, is the surprise at the actual construction, that is, almost all the villages in the city, urban renewal, retreat II covering all three projects into account, but the specific implementation to achieve the number of land supply, which is uncertain.

所谓的闲置土地到底量有多大我没有研究，但是举例说明：石家庄08年有数字报道报建量高达4500万平米，实际是突击报建，也就是几乎把所有城中村、旧城改造、退二进三工程全部涵盖进去，但是具体实施能实现多少土地供应，这是个未知数。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。