这个问题困扰了人们多年，直到20世纪50年代，一位名叫古斯塔夫·克雷默的德国科学家给出了一些答案，并在此过程中提出了新的问题。
The question perplexed people for years, until, in the 1950s, a German scientist named Gustave Kramer provided some answers and, in the process, raised new questions.
拜约·克塔塔二世被铭记。
在13世纪阿兹塔克人扫荡到墨西哥中部时，陶蒂华康这座繁华的城市（在公元400年左右为最繁华时期）已经被它神秘的建造者们遗弃很长一段时间。
By the 13th century when the Aztec swept into central Mexico, the once teeming city—which reached its zenith around a.d. 400—had been long since abandoned by its mysterious builders.
不过，阿黛勒后来能够闻名于世，全因为古斯塔夫·克林姆特在1907年为她作画。
But the Adele the world came to know was as Gustav Klimt had painted her in 1907.
奥克塔维亚·希尔是19世纪英国的慈善家和女性环境主义者，更是一位杰出的住房改革家。
Octavia Hill was a philanthropist, a female environmentalist as well as a brilliant housing reformer in the 19th century Britain.
奥克塔维亚·希尔是1 9世纪英国的慈善家和女性环境主义者，更是一位杰出的住房改革家。
Octavia Hill was a philanthropist, a female environmentalist as well as a brilliant housing reformer in the 19th century Britain.
奥克塔维亚·希尔是1 9世纪英国的慈善家和女性环境主义者，更是一位杰出的住房改革家。
Octavia Hill was a philanthropist, a female environmentalist as well as a brilliant housing reformer in the 19th century Britain.
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