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rational interval
 rational interval abbr.
tech. 有理区间
| function
 function abbr.
gen. 运行; 工作
hydroel.st. 作用
interntl.trade. 效用; 职能
light. 功能,用途
math. 运算
met. 功用; 用途

to phrases

rational interval

tech. 有理区间
rational interval
: 2 phrases in 1 subject
Technology2

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