diagonal [ dia- = across 对面的；gon = angle 角；-al a. = being“being across angles 横跨对面角的”→]a. ① connecting two corners that are not next to each other 对角的 / A four-sided plane has two diagonal lines. 四边形有两条对角线。② slanting 斜的 / The ship sailed on a diagonal course across the Atlantic. 轮船取一条倾斜的航线穿过大西洋。

下面是dia-的异体di-出现在元音字母前的两个例子。

diorama [ di- (dia- ) = through 通过；orama ( horama ) = sight 景 =>“a sight seen through a hole 通过小洞看到的景”→ ] n. picture that is usually looked at through a small opening 从小孔观赏的画片，西洋景，西洋片/ The diorama is rarely seen nowaday. 如今西洋景这玩意儿是很少见了。

dioramic a. 西洋景的

diuretic [ di- ( dia-) = through 通过；uret = urine 尿； -ic a. = tending to 易于=> “tending to let urine through 便于尿液通过的”→]n. tending to increase the flow of urine 利尿的 / The doctor prescribed his patient a diuretic receipt.医生给病人开了一张利尿的药方。

diuresis n. 利尿；多尿