Allogeneity
异种性, 异质性
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
How much does packing take up of the total cost of the goods?
包装占货物总成本的百分比是多少？
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。