If the reaction of the person becomes emotional, then it is possible to make contact with them, touching them gently on the arm or shoulder.

如果人的反应变为情绪上的，那你就可以接触他们，轻轻碰触他们的手臂和肩膀。

youdao

In Mediterranean countries, if you refrain from touching someone's arm when talking to them or if you don't greet them with kisses or a warm embrace, you'll be considered cold.

在地中海国家，如果你和别人交谈时没有碰对方的手臂，或见面问候时没和对方亲吻拥抱，别人会认为你不热情。

youdao

"I wear this when I travel," he says, touching the arm of the sweater again.

“我旅行的时候会穿上这件衣服，”他一边说，一边再度触摸毛衫的袖子。

youdao

Lera sat down and slid her hand across the table, touching his arm.

NEWYORKER: The Repatriates

When blogger Violet Blue--who has pictures of herself posing with her Apple laptop on her Web site--approached Jobs on the floor of the MacWorld Expo to ask for a photo, lightly touching his arm, Jobs rebuffed her.

FORBES: What Bugs Apple Fans

Try this: Choose one nonverbal behavior (say, touching a colleague on the arm) and list all the conditions under which this behavior would be acceptable in your company or organization.

FORBES: How to Read Business Body Language Like a Pro - 1st Tip