1·Among the proposed explanations were diseases, harsh temperatures and higher pollution levels associated with winter when those expectant mothers and near-term foetuses might be most vulnerable.
研究人员给出的解释是冬天疾病泛滥，天气苦寒，污染浓度高，而此时的准妈妈和待产的宝宝们往往都非常脆弱。
2·It is the most important technical problem for the dyeing and printing mills to select dyes from so many reactive dyes to combination dyeing and get the expectant effect.
在众多的活性染料中，如何选择染料拼色且达到预期的染色效果，是目前印染厂最为关注的。