the varieties are infinite; but two classes may be roughly seen.
鳥的飛行方式千差萬別，但大體上可分為兩類。
新概念英語第四冊
Lesson 23 Bird flight
?? 句中詞匯解析
從本句中提取的重要詞匯
adj. 極大的;無法衡量的; 無限的;無窮盡的;
n. 無限的事物;無窮盡的事物; 上帝;
?? in無+fin結束，范圍+ite有...的 → 沒有范圍的 → 無限的
"The universe seems infinite."
宇宙似乎是無限的.
近義：infinity, boundlessness, illimitable, immeasurable, immense, incommensurate
反義：limited, qualified, constricted
adv. 粗略地;大體上;大致上;粗暴地;
"Red blood cells are roughly the shape of a disk."
紅細胞大致呈圓盤狀。
近義：about, approximately, around, loosely, nearly, barely
反義：minutely, painstakingly, scrupulously, thoroughly, carefully, circumstantially
v. 看見( see的過去分詞 );觀看;領會;考慮;
"The aforementioned person was seen acting suspiciously."
有人看見前面提到的那個人行動可疑。