Of course, it came as a big surprise when tears came up, no matter how hard I tried, I wasn't able to control myself.
当然，当眼泪涌上来的时候，我感到很惊讶，无论我怎么努力，我都无法控制自己。
3
One theory is that crying may have evolved as a kind of signal — a signal that was valuable because it could only be picked up by those closest to us who could actually see our tears.