be decaying
用于进行时，表示持续衰减或腐朽的过程。
The old building is decaying.
旧建筑正在腐朽。
衰减
腐烂过程；衰退过程；颓坏；衰减；腐蚀作用
losing a stored charge, magnetic flux, or current
腐烂过程；衰退过程
The process of undergoing decay.
The charge in this battery is decaying slowly, so the flashlight is getting dimmer.
这块电池里的电量正在慢慢衰减，所以手电筒越来越暗。
用法提示：decaying 与 is 构成现在进行时，表示电量逐渐减少。
After the circuit is opened, the current starts decaying until it reaches zero.
电路断开后，电流开始衰减，直到降为零。
用法提示：starts decaying 中 decaying 是动名词，作 starts 的宾语，表示电流逐渐减小。
The magnetic flux inside the coil keeps decaying even after the switch is turned off.
开关关闭后，线圈内的磁通量仍在不断衰减。
用法提示：keeps decaying 中 decaying 是动名词，作 keeps 的宾语，表示磁通量持续衰减。
用于进行时，表示持续衰减或腐朽的过程。
The old building is decaying.
旧建筑正在腐朽。
现在分词作定语，修饰名词，表示正在腐败或衰败的事物。
He pulled out a decaying tooth.
他拔掉了一颗正在腐烂的牙齿。
decomposing强调有机物的化学分解过程，而decaying更泛指逐渐衰败或衰减
declining多用于数量、质量或健康状况的逐步下降，decaying则侧重物质腐烂或功能失效
rotting特指有机物因细菌或真菌作用而腐烂，decaying范围更广，可用于非生物（如信号）
发长 /eɪ/ 音 (如 day, play)
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