expense
energy
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strenuous
require great effort, need great effort, need effort, require effort
這 項 工作 太 費勁 了。
This job is too strenuous.
爬山 對 我 來 說 太 費勁 了。
Climbing mountains is too strenuous for me.
學習 中文 是 一 個 費勁 的 任務。
Learning Chinese is a strenuous task.