1.家长们这种动不动就以保护者姿态站出来替孩子说话的行为是导致我们与其他家庭的孩子相处时维持小心翼翼的态度的原因之一.
主语：This jumping to our children's defence
what fuels the ''walking on eggshells'' feeling 补充说明part of
that surrounds our dealings with other people's children 用来补充说明 是什么样的feeling
2.现在家长们向校方发难以便尝试把责任归咎于孩子们的老师.
charge up to = charge to,让某方负责的意思 例如 I'll have to charge this (up) to your account.I'll charge the total (up) to your bill.
have a go 是尝试的意思,等于 have a try