1.struggle to do 挣扎做某事 It's a constant struggle to try to keep them up to par. 要让他们达标,需要不断努力iiQ-VH62U5#x。 )F@9Xz4z|0ARdk5Nz~Laxte^Q6e;XpCGxf|AP+J7K[udAUQ!4yn]s@]qOqB574eEwsq4yECv6#jG(qJ3%|va.%PCf(j4来源:可可英语 http://www.kekenet.com/broadcast/202007/613825.shtml