xiān / qiǎn / bù / duì / yǐ / jīng / dǐ / dá / biān / jìng / děng / dài / zhǔ / lì / bù / duì / dào / lái

先遣部队已经抵达边境，等待主力部队到来。

The advance unit has reached the border and is waiting for the main force.