1. come on in（口語(yǔ)）

來(lái)吧；進(jìn)來(lái)吧；請(qǐng)進(jìn)

eg. I hope he'll say, Come on, come on in. I'm glad to see you.

誰(shuí)也說(shuō)不準(zhǔn)，我希望主會(huì)對(duì)我說(shuō)，來(lái)吧，來(lái)吧，見(jiàn)到你很高興。

eg. "Welcome," he said, and "Come on in.

“歡迎，歡迎，”他說(shuō)道，“過(guò)來(lái)吧，進(jìn)來(lái)啊？”

2. go ahead（口語(yǔ)）

前進(jìn)；進(jìn)行

eg. The district board will vote today on whether to go ahead with the plan.

區(qū)理事會(huì)將于今天就是否執(zhí)行該計(jì)劃投票。

eg. If you insist on leaving now, please go ahead.

你一定要走，那就請(qǐng)便吧。

3. join in

加入；參加

eg. Everybody likes to join in this activity.

每個(gè)人都愿意參加這一活動(dòng)。

eg. If you cannot attend, you can still join in the conversation.

如果你無(wú)法參加，你還可以 加入到談話中來(lái)。