It is advisable to mix coarse grit into heavy soil to improve drainage.

　　建議將粗砂摻到黏重的土壤里，以提高排水性能。

　　South Asia continues to be the most dynamic economic region in the world.

　　南亞仍然是世界上經(jīng)濟(jì)最活躍的地區(qū)。

　　Time's up ─ have you worked out the answer yet?

　　時間到了，你得出答案了沒有？