each according to his ability; 各尽所能
lacking in ability; incompetent; 无能
electric [electrical] energy; 电能
chemical [atomic] energy; 化学[原子]能
able person; man of large calibre 能人
The patient was but poorly able to sit up. 病人仅能勉强坐起来。
It was felt that she was perfectly capable of taking care of herself. 人们认为她完全能照顾自己。
Nai Yuanhao 能元皓
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)