The practice of infanticide, and suicide among the old people, seems to have been a factor of survival of food scarcity.请问这个句子如何翻译?尤其是 a factor of survival of food scarcity 的翻译。
According to the author, the burning issue concerning immigrations is how to help immigrants to better fit into American society. 在这里concerning是介词吗,然后介词短语做定语?还有这样的词吗?concerned 可以这样用吗?