Science currently recognizes around 1.8 million species on Earth (out of an estimated five million to 30 million total species—the true total remains unknown).
目前科学界已经知道的全球物种大约有180万个（而根据推测，全球总共有500万到3000万个物种——实际上，地球到底有多少物种还不确定）。
Total solar eclipse is a rare phenomena, the ancients as a result of unknown causes, was given to give a lot of solar mystery.
日全食是一种罕见的天象，古人由于不明原因，于是就给日食赋予了许多神秘色彩。
One of the schemes adopts the integral equation with equivalent current as an unknown function, whereas the other USES the integral equation with total electric field as an unknown function.
一种方案采用以极化电流为未知函数的积分方程，另一种方案采用以总电场为未知函数的积分方程。
It is widely used in channel control surveying to define the coordinates of unknown points by ranging intersection for setting free-station of total station.
利用全站仪自由设站测边交会确定待定点的坐标，在航道控制测量工作中得到较好的应用。
Still, I only required to smile at totally unknown people, who unhesitatingly smiled back and welcomed me, a total stranger, not only into their houses, but also into their hearts.
不过，我只需要对陌生的人们投去微笑，他们便会毫不犹豫地回我一个微笑，这样不仅能够走进一个完全陌生的人的家，还能走进他们的内心。
The total cost of the elevator installation is unknown, as it is still in the design phase with the MTA.
电梯安装的总成本还是未知数，因为还处在MTA的设计阶段。
The total cost of the elevator installation is unknown, as it is still in the design phase with the MTA.
电梯安装的总成本还是未知数，因为还处在MTA的设计阶段。
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