Roughly 30 times per second you see the star become bright and then go dim again.

大概是30次每秒，这行星开始变亮，然后又再次变暗。

youdao

All human languages go back to the dim uncertainty of prehistory, and at present we have no way of knowing for sure whether or not they can all be traced back to the same root.

人类所有的语言都可追溯到朦胧的史前时期，但目前我们还无法确定这些语言是否都同宗同源。

youdao

All human languages go back to the dim uncertainty of prehistory, and at present we have no way of knowing for sure whether or not they can all be traced back to the same root.

人类所有的语言都可追溯到朦胧的史前时期，但目前我们还无法确定这些语言是否都同宗同源。

youdao