As regarded its origin there were various explanations, all of which must necessarily have been conjectural.
至于其来源,则有着种种解释, 当然都是些臆测.
英汉文学 - 红字
Theories about the extinction of dinosaurs are still highly conjectural.
关于恐龙灭绝的理论仍然是带有很强的猜测性的.
互联网
"theories about the extinction of dinosaurs are still highly conjectural"
"the supposed reason for his absence"
"suppositious reconstructions of dead languages"
"supposititious hypotheses"
