People just drop by and knock on your door.(人們只會過來敲你的門。)

The IEA estimates that the output from mature fields outside OPEC would naturally drop by about 11% a year.(國際能源署估計非歐佩克成員國內的成熟油田產量每年將自然下降11%。)

A decade from now, crop yields in some parts of Africa are expected to drop by 50%.(從現在算起，十年后，非洲一些地區的糧食作物預計將減產50%。)

Ms Wheelan forecasts that it will drop by another 9% by March 2009.(MsWheelan預計到2009年3月它將再下跌9%。)

Drip, or "micro" irrigation, as the name suggests, is stingier with the water, delivering it to the roots of plants drop by drop.(滴灌，或者“微”灌溉，顧名思義，是更吝嗇于水，把水一滴一滴地滴到植物的根部。)

"We must take into consideration that more and more people just drop by," Mr. Zajac said.(“我們必須考慮到越來越多的人僅僅只是順路進來參觀，”扎亞茨先生說。)

Just a decade from now, crop yields in some parts of Africa are expected to drop by 50%.(僅在十年以后，非洲某些地方的農作物產量預計將減少50%。)

Visitors may drop by unexpectedly, resulting in tension with your lover.(可能會有意想不到的客人來訪，使你和愛人之間的關系緊張。)

Drop by the Web site, join the mailing lists, or find another way to get involved.(請訪問Web站點，加入郵件列表，或者尋找其他加入的途徑。)

Sit with an open door and encourage members to drop by anytime and talk to you.(開門辦公，歡迎團隊成員在任何時候都可以找你談談。)