growing pains发展: develop; expand; grow; burge ...时期: period的: 4次方是 The fourth power of 2 i ...困难: difficulty; difficult; hard; ...发展时期所面临的困难: china's growing pains下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:发展时期的困难，即可在微信中查询翻译
