多么糟糕的英文：
tant pis

pis是什么意思：
n. 圆周率符号
abbr. 私人调查员；生产率指数；形式发票

The chief reason for this choice was that the PI was mathematically tractable
这样选择的主要原因是这种性能指标在数学上便于处理。

Mooncakes are to Mid-Autumn Festival what mince pies are to Christmas.
中秋节吃月饼就像西方人圣诞节吃百果馅饼一样，是必不可少的。

No one knew exactly how many pies his thumb had explored.
谁都不清楚他插手了多少事情。

Why is alanine predominantly zwitterionic rather than completely uncharged at its pI?
为什么在等电点pH时，丙氨酸主要为兼性离子而非完全不解离的形式？