be in pieces meaning in Chinese

碎了，成了碎片

At present , the utilization of the underground space in our country is still in its primary stage , progress ever has achieved both in theory and practice is limited , and most of all is in pieces and lacking of system , and mostly concentrates in the field of construction engineering
目前，我国城市地下空间利用仍处于探索阶段，理论研究和实践在有限范围内已经取得一些进展，但从总体上看，这些进展多集中在建筑工程技术层面，且多是零散，缺乏系统性。