The reason for this is a little unclear, but it's probably a combination of Confucian filial piety and the fact that the parents have sacrificed and done so much for their children.
They have been grown for so long, in fact, it is unclear what wild relative the plant has.
由于种植时间很长,人们也不太清楚他是从那种野生植物演变来的。
3
Unclear legal language "is an ancient tradition," he said, "stemming from the fact that the language of law was first Latin, then French and finally English."