The thief tried to burrow a narrow path downward.

　　小偷試圖朝下挖出一條窄窄的通道。

　　Prices are tending upward [ downward].

　　物價(jià)趨漲[降]。

　　Downward movement is much faster than upward one.

　　向下移動(dòng)比向上移動(dòng)快得多。

　　He had a physical strength that matched his outward appearance.

　　他的體力與他的外形相稱。

　　Mark showed no outward signs of distress.

　　馬克在外表上沒有現(xiàn)出沮喪的神色來。