1、Her face showed a placidity that suggested she was unfazed by the chaos around her.
她的脸上流露出一种平静，似乎对周围的混乱毫不在意。
2、He approached the situation with placidity, refusing to let it affect his inner peace.
他以平静的态度面对这种情况，拒绝让它影响他的内心安宁。