人们并不知道第一缕光线出现的时间。

The exact timing for first light is not known.

youdao

那天清晨，看到太阳的第一缕光线时所有游客都异常兴奋。

All the tourists were excited when seeing the first rays of the sun that early morning.

youdao

那天清晨，看到太阳的第一缕光线时所有游客都异常兴奋。

All the tourists were excited when seeing the first rays of the sun that early morning.

youdao