Crack extension force
[化] 裂紋擴展力
?? 詞語組成解析
crack
[kr?k]
vt. 破裂，打開;（使…）開裂;說（笑話）;開瓶;
vi. 斷裂，折斷;碎裂聲，爆裂聲;鏡子破裂了;失去控制，衰退;
n. 裂縫;試圖;縫隙;（可聽到響聲的）重擊;
adj. 訓練有素的;技藝高超的;優秀的;一流的;
force
[f?:s]
n. 力;武力;（社會）勢力;魄力;
vt. 強迫;強行;促使，推動;強奸;
??? 情景例句
He is tough in doing everything.
他不管做什么事都很有毅力。
I appreciate your helping me.
感謝你的幫助。
but ten months later, she received a letter from a girl in Holland.
但10個月以后，她收到了荷蘭一位姑娘的來信。