n.勇氣、鬥志 [courage and fortitude]
ex. troops who showed their mettle in combat.
字源：mettle是「metal」的變體，是後來人為了文學上的用法改寫的，mettle採取了金屬在於 形象上 的用法，ex.鋼鐵搬的意志，常被解釋作為勇氣、鬥志
adj.勇敢的 [spirited; courageous.]
ex. In the chilly autumn wind, the soldiers set out with a mettlesome and handsome bearing.
n.微生物;(尤指引起疾病的)細菌 [ A minute life form; a microorganism, especially a bacterium that causes disease. Not in technical use.]
n. 微生物 [any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.]
n. 顯微鏡 [an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye.]
adj.只能從顯微鏡裡看到的 [so small as to be invisible or indistinct without the use of the microscope ]
ex. microscopic organisms
adj.顯微鏡的 [of, pertaining to, or involving a microscope]
n.小爭執 [A petty quarrel or argument; a tiff. ]
v.使惱怒 [Annoy] (2015 update)
ex. My teacher seems be miffed by these naughty boys .
程度 tiff < squabble <quarrel、dispute
字源：tiff 與 miff是擬聲詞，就類似在爭吵時你「哼」了
adj.強大的;強有力的 [showing superior power or strength]
ex. mighty God
ex. Once a mighty empire ruled the world.
adj.遷移的 [Traveling from one place to another at regular times of year, often over long distances. Salmon, whales, and swallows are all migratory animals.]
ex. Many migratory birds visit this lake annually.
n.里程碑 [a stone functioning as a milepost.]
n.劃時代的事件 [a significant event or stage in the life, progress, development, or the like of a person, nation, etc]
ex. Her getting the job of supervisor was a milestone in her career.
n. 民兵 [An army composed of ordinary citizens rather than professional soldiers.]
ps. military [milit-ary] n.軍隊、陸軍
n.磨坊 [A building equipped with machinery for grinding grain into flour or meal.]
ps. windmill r
v.將...磨成粉 [To grind, pulverize , or break down into smaller particles in a mill.]
ex. mill the grain into flour.
n. 啞劇 [The art of portraying characters and acting out situations or a narrative by gestures and body movement without the use of words; pantomime .]
n. [An actor or actress skilled in pantomime.]
v. [To ridicule by imitation; mimic.]
猜字遊戲通過 動作 來表現字＝啞劇通過 動作 來表現故事