Complementary angles
n. [數] 余角
?? 詞語組成解析
complementary
['kɑmpl?'m?ntri]
adj. 互補的;補充的，補足的;
com加強+ ple填滿+ ment表名詞 + ary...的 →complement填滿=補充+ ary...的 → 補充的
n. 角度（angle的復數）
??? 情景例句
I don't have time to be exhausted.
我沒有時間去精疲力盡。
Please quote us your price on FOB basis, indicating the postage for dispatch by parcel post to Dalian via Tianjin.
請報FOB價，注明郵寄包裹途經青島至大連的郵資。
and at the most critical juncture we took turns in watching that point.
在最緊急的時刻，我們輪流監視那段河流的險情。