ad lib 即興表演；講話中臨時插入：to improvise; interpolate during speech
When the actress forgot her lines during the second act, she had to ad lib in order to keep the show going. 在第二幕中女演員忘記了臺詞，為使演出繼續下去，她只得即興發揮了一通。
advance on or upon 朝…前進，向…推進：to get nearer to; to gain in distance during pursuit of criminals or the army of the enemy.
The American troops were soon advancing on the Germans after they landed at the beaches of Normandy toward the end of World War Ⅱ. 將近第二次世界大戰結束時，美軍在諾曼第海灘登陸後即迅速向德軍陣地進擊。
A little knowledge is a dangerous thing.
A little knowledge is a dangerous thing. 一知半解最危險：A person who knows a little about something may think he knows it all and make bad mistakes. —A proverb.
John has read a book on driving a car and now he thinks he can drive. A little knowledge is a dangerous thing. 約翰讀了一本關於汽車駕駛的書，現在就以為自己會開車了。一知半解最危險。
all the same or just the same
all the same or just the same 仍然；依然；照樣：as if the opposite were so; nevertheless; anyway; anyhow; still
Everyone opposed it, but Sally and Bob got married all the same. 雖然人人反對，但薩莉和鮑勃還是結了婚。
a must 不可避免的事物、必不可少的東西；極為有趣的事件；值得紀念的事件、難忘的事件
Visas in many foreign countries are a must. 在很多外國，籤證是必不可少的東西
Alfred Brendel's Beethoven master classes are open to the public and are not to be missed; they're a must. 阿爾弗雷德·布倫德爾的貝多芬高級音樂課向公眾開放，不應錯過；絕對該去聽聽它們。