專家:須以更高強度混凝土修正港鐵車站有問題柱的「低級錯誤」

英文原標題：Stronger concrete needed to fix ‘basic mistake’ of defective MTR station columns: experts

英文原摘要：Hong Kong’s railway operator can use high-strength concrete to rectify the structure of dozens of defective columns at a station under construction, an engineer and a construction sector leader have said, describing the shoddy work as a “basic mistake”. Their remarks came after the Buildings Departm