If unknown to the sensors, objects appear yellow.

如果传感器不能分辨敌我，目标将显示为黄色。

youdao

Cities are within a region of a country and have a (pure ASCII) name, an accented name (which might include foreign characters), a population (or 0, if unknown), a latitude, and a longitude.

城市属于某一国家的某一地区，城市信息包括(纯ascii)名称、带重音符的名称(可能包含外文字符)、人口数(如果人口数未知，就是0)、纬度和经度。

youdao

If the symbol were Coptic, the first symbol would be "ra" and then an unknown symbol followed by a double "S" sound.

所以如果这个符号是埃及古语，第一个符号应该是“ra”，然后是一个未知的符号，后面跟着一个双“S”音。

youdao

If hoarseness continues or the cause is unknown, doctors should perform an examination called a laryngoscopy.

VOA: special.2009.09.02

- "She lived unknown and few could know"-- how can she be unknown if few know anything about her?

她不为人知地活着，鲜有人知道她“,如果有任何人知道关于她的任何事情,又怎么能说他不为人知呢？

耶鲁公开课 - 文学理论导论课程节选

If you do that, you will find there is one unknown, which is v0, and we can solve for v0.

这样就只剩下一个未知量了,也就是 v0,我们就能解出 v0

耶鲁公开课 - 基础物理课程节选

If an unknown piece of code snuck past the defenses but is now known they can identify it on the hosts.

FORBES: Security Intelligence Enters Mainstream

It was unknown if health visitors, GP staff or nursery workers would be involved.

BBC: Free parenting classes trial to run in England

It is unknown if he was freed, rescued by Algerian forces, or managed to escape.

BBC: Algeria siege: Alex Salmond confirms Scots among hostages