foot by foot

基本解釋

Notice that you started with a 4 foot by 8 foot piece of plywood.
先要找一塊4X8英尺的夾板。
Dingee and several other soldiers were on garbage detail, digging six foot by six foot holes in the ground, when a group of soldiers headed out on patrol came by.
有一次，迪丹吉和其他數(shù)名士兵，正在地上挖一個6英尺見方的垃圾坑時，一組執(zhí)行巡邏任務(wù)的士兵從他們旁邊經(jīng)過。路過的士兵詢問挖坑的人，你們的家鄕在那裡。
Foot by laborious foot, such hauling may go on for hours, even days.
艱難的一步又一步，多麼用力的活也許持續(xù)幾小時，甚至幾天。
blog.sina.com.cn

The sign is formed by a line across the right foot of the letter "R."
taxi or by foot. You know, it's a small city, so you can...
出租車或者是步行。舊金山是個小城，所以你可以……
舊金山的公共交通 - SpeakingMax英語口語達(dá)人
They traveled on foot, by horseback and by boat to reach the gold fields.

The effects of depressurization on internal structures is not intuitively obvious to non-engineers, but a 20 foot wide by 20 foot high wall that sees a 1.2 psi rapid pressure decrease feels a load of about 70, 000 lbs of horizontal force.
FORBES: Tornados and Nukes -- How Big Can They Get?