As the lightest gas, hydrogen is the one that most easily overcomes a planet's gravity.

　　由于氫氣是地球上最輕的氣體，因此最容易掙脫地球引力。

　　I don't go brown very easily.

　　我不容易曬黑。

　　He could easily vault the wall.

　　他可以輕而易舉地躍過這堵墻。

　　Bananas are easily digestible.

　　香蕉易于消化。

　　She's not easily frightened.

　　她不是輕易能嚇倒的。