Pericambium
周边形成层(指根的中心柱最外部细胞层)
🗣️ 情景例句
Couldn't agree more.
绝对同意。
We'll exchange presents.
我们要交换礼物。
Early next morning, she heard planes passing overhead and wondered how she could send a signal.
第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。