1、
check valve for tandem circuit, parallel circuit as an option, semi priority circuit as an option
单向阀用于串联回路，可选用于并联回路，半优先回路
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2、
3、
This short-circuiting implicitly gives the highest priority to the leftmost alternative.
这种短路行为隐式地给予最左边的选项以最高优先级.
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