没有人知道它们是什么时候被种植的。

No one knows when they were first planted.

youdao

住宅被完成和植物被种植的同时，客户要求一个额外层，他可以在树梢之间做瑜伽。

Once the house was complete and the planting in place, the client asked for an extra storey where he could practice yoga among the tree tops.

youdao

这种情形始于在目标地区（如废弃矿井或被污水污染的灌溉池）种植超积累物种。

This scenario begins with the planting of hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff.

youdao

That meant that people growing corn were less-- less vulnerable to having things wipe out entire crops because there were different types of crops planted around the world, so the world corn supply would never be threatened by anything.

也就是说只要人们种植玉米,整个粮食体系就不可能那么轻易被摧毁,由于世界各地种植着不同品种的玉米,世界玉米供应不会受到任何影响

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选