gōng / dì / shàng / jǐ / tái / wā / jué / jī / xiè / tóng / shí / zuò / yè / xiào / lǜ / tí / gāo / le / bù / shǎo

工地上几台挖掘机械同时作业，效率提高了不少。

Several excavators working simultaneously on the construction site greatly improved efficiency.