because [bɪ'kɔz] 词频1 词根: be

conj. 因为;

💡 cause, cuse 表原因,目的;司法程序,诉讼

"He was arrested because of his political affiliation."

近义：since, whereas, for, forasmuchas

surface ['sɝfɪs] 词频1 词根: fac

n. 表面;外观，外表;地面。水面; vi. 浮出水面;在表面工作;显露; vt. 使浮出水面;使成平面; adj. 表面的，外观的;外表上的，平地上的;肤浅的;

💡 sur超过，在上面+face脸面→表面

"Once in the bloodstream, the bacteria adhere to the surface of the red cells."

近义：appear, arise, loom, materialize, outcrop, rise

earth [ɝθ] 词频1

n. 地球;陆地;泥土;兽穴; vt. 把（电线）接地;盖（土）;追赶入洞穴; vi. 躲进地洞;

💡 耳屎(谐音):耳朵屎长得有点像 泥土-泥土当然长在 地球上啦 ear(耳朵)+t(植物)+h(动物):听到感受到的一切之所在- 地球

"I rammed down the earth around the newly - planted tree."

近义：ground, hill, mound, bank, plains, mainland

flat [flæt] 词频1 词根: fl-

adj. 平的;单调的;不景气的;干脆的; adv. （尤指贴着另一表面）平直地;断然地;水平地;直接地，完全地; n. 平地;公寓;平面; vt. 使变平;[音乐]使（音调）下降，尤指降半音; vi. 逐渐变平;[音乐]以降调唱（或奏）;

💡 l(一根管子)+fat(胖):用一根管子对你 对气你就变胖了- 吹气

"They complained about the excessive noise coming from the upstairs flat."

近义：blowout, apartment, level, plain, bare, smooth 反义：irregular, lopsided, askew, asymmetric, asymmetrical, rough

round [raʊnd] 词频1

adj. 圆形的;弧形的;丰满的，肥胖的;整数的; adv. 到处;在周围;迂回地;朝反方向; prep. 大约;绕过，环绕;（表示位置）在…四周;附近; n. 圆，圆形;循环;圆形物，球状物;（会议的）一回合; vt.& vi. 使成圆形;绕行;拐过，绕过;把…四舍五入;

💡 轻揉(rou) 圆脑(n)袋(d)

"She's a good all-round player."

近义：circle, cycle, bout, gyre, set, game 反义：rectilineal, straight, undeviating, direct, squared