birds became restless when they would normally have begun migration in the wild。 他發現那些本該在野外開始遷徙的鳥在被困於籠中時會變得焦躁不安。
restricted［ri'striktid］a。 限制的；受約束的
例句 1。 The produce was transported to cities where the consumption of fruit and vegetables was no longer restricted to the wealthy。 農產品被運送到城市中去，在那裡水果和蔬菜的消費群體不再只侷限於富裕的人。
2。 The Columbian white…tailed deer was once very mon in the open prairie country； but now it is restricted to the low and marshy islands。 在遼闊的草原國家，哥倫比亞白尾鹿曾經一度十分常見，可是現在卻只能在低地和溼地看到了。
route［ru：t］n。 路線；路程
例句 1。 Through this route； people would be able to enter the southern areas of America。 透過這條路線，人們可以到達美國南部區域。
2。 Rock paintings in the Sahara prove that horses and chariots were used to traverse the desert and there were trade routes across the Sahara。 撒哈拉沙漠中的岩石壁畫證明馬匹和車輛曾被用作穿越沙漠的工具，而且存在橫穿撒哈拉的貿易路線。
3。 The camel transformed the desert from a barrier into more accessible route of trade and munication。 駱駝把沙漠從一個障礙轉變成一個可以通行的貿易和交流路線。
rural［'rur？l］a。 鄉村的，農村的；田園的
例句 1。 Increased agricultural production made great contributions to the development of the rural industry。 日益增長的農業生產對鄉村工業的發展作出了極大的貢獻。
2。 Cities are warmer than the surrounding rural areas； which produces a phenomenon called the urban heat island。 城市比周圍的農村地區溫度要高，這產生了一種稱做城市熱島的現象。
3。 A deep attachment to the land and the stability which rural life engendered； fostered the Roman virtues。 對土地深深的依戀以及鄉村生活的穩定性造就了羅馬人的美德。
screen［skri：n］n。 螢幕 v。 掩蔽；