But their Numbers have dwindled since the dawn of the 20th century, with unknown consequences for ocean ecosystems and the planet's carbon cycle.
但自20世纪初以来，它们的数量已逐渐减少，随之而来的是由此对海洋生态系统和全球碳循环产生的未知后果。
He remained unknown to his professors, publishing instead the translations of François Villon, a rebellious 15th-century French poet, that launched his literary career.
取而代之的是，他热衷于发表弗朗索瓦-维庸（FrançoisVillon）的译作，这位15世纪法国的叛逆诗人开启了他的文学生涯之门。
This mare of unknown ancestry was located in central Iowa during the early part of the twentieth century.
这种未知的祖先马奶位于爱荷华州中部，在二十世纪早期的一部分。
Until the 18th century the technology for making porcelain was unknown in Europe and what there was had all been imported.
到十八世纪为止，欧洲人对瓷器的制作工艺还一无所知；如果那个时候有人在欧洲看到瓷器，那它们肯定都是进口货。
To explore, to see, to listen, and to discover the unknown world - the 21st century.
探索，观察，聆听，认识一个未知的世界——21世纪。
Mankind has created hitherto unknown material and spiritual wealth in the 20th century, but has also been subjected to the scourge of wars and the threat of war.
在20世纪里，人类创造了前所未有的巨大物质和精神财富，同时也惨遭战争劫难和战争威胁之苦。
Modern scholarship accepts that the book was written not by St. John the Apostle but by various unknown authors in the late 1st century AD.
现代学术同意，本书是由圣若望宗徒，但在公元1世纪后期的各种未知的作者不是。
At an unknown moment in the fifth century BCE, the Cadusians were subjected by the Persians.
在一个未知的时刻，公元前五世纪的Cadusians受到了波斯人。
The invention of the visible light microscope late in the 16th century introduced a previously unknown realm of single-celled plants and animals.
16世纪后期，可视光学显微镜的发明使人类第一次观察到了单细胞动植物的世界。
Roller skating was developed from ice skating. Based on related information, roller skating was invented by an unknown Dutch in the 18th century.
轮滑运动时从滑冰运动过渡而来，据有关资料记载，轮滑在十八世纪由不知名的荷兰人发明的。
Roller skating was developed from ice skating. Based on related information, roller skating was invented by an unknown Dutch in the 18th century.
轮滑运动时从滑冰运动过渡而来，据有关资料记载，轮滑在十八世纪由不知名的荷兰人发明的。
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