Some pieces of art aren't finished until the artist has added color.

有些藝術作品必須等藝術家上好顏色才算完成。

These students are using markers and colored pencils to add color to their drawings.

這些學生用馬克筆與色鉛筆來為他們的圖畫上顏色。 

The girls work very hard, rehearsing their dance routines with their instructor.

這群女孩子很認真和老師排練他們的舞步。

In this dance routine, there are some parts where the girls dance in pairs.

這套舞步有些部分需要兩個女孩子共舞。 

Some teachers are in the back of the classroom observing the class.

有些老師在教室後面觀課。

Teachers improve their teaching skills by observing others' classes.

老師藉由觀課來提昇自己的教學技巧。