There is a growing tendency among employers to hire casual staff.

　　雇主雇用臨時(shí)職員有增加的趨勢(shì)。

　　To the casual observer, the system appears confusing.

　　乍看起來(lái)，這個(gè)系統(tǒng)好像條理不清。

　　It's obvious even to the casual observer.

　　即便再馬虎的人也能一眼看明白是怎么回事。

　　He tried to sound casual, but I knew he was worried.

　　他講話時(shí)試圖顯得不在乎，但我知道他心里著急。

　　Add a scarf for a casual effect.

　　再圍上一條圍巾以顯得隨便些。