Help yourself to dinner
随便───casual;用餐───have meals
The disease is not spread by casual contact.───此病不会通过偶然接触传染。
The boy was cheeky and casual.───这个男孩嘻皮笑脸、随随便便。
She dresses with casual elegance.───她的穿着随意而不失雅致。
'Yeah, great, thanks, ' he said, fighting to keep his voice casual as he stood up to let her in.───“好的，好，谢谢，”他打开门，尽力使自己的声音恢复正常，让她进来。
The site makes it easy to carry on a casual conversation or ask group questions.───朋友们可以在Facebook上轻松交谈或者展开小组讨论。
"It would be easy to dismiss [casual search behavior], except for the fact that people are doing it, " he says.───“除了人们正在进行随机搜索这一事实本身，（随机搜索行为）很容易被忽略掉”，他说。
It's difficult for me to be casual about anything.
His eyes were angry, though he sounded casual.
They have a casual attitude towards safety .
He tried to look casual.
She usually wears smart/casual clothes.