join in
参加, 加入
例句1, She decided to join the school’s debate team to improve her public speaking skills.
她决定加入学校的辩论队，以提高她的公众演讲能力。
例句2, He was excited to join the company as a junior developer and start his career in tech.
他兴奋地以初级开发人员的身份加入公司，开始了他的科技职业生涯。
例句3, We invited our neighbors to join us for dinner and had a wonderful evening together.
我们邀请邻居们和我们一起吃晚饭，度过了一个美好的夜晚。
例句4, The two rivers join at the edge of the city, creating a picturesque landscape.
这两条河流在城市的边缘汇合，形成了一幅如画的风景。
例句5, She used a special adhesive to join the broken pieces of the vase back together.
她使用了一种特殊的粘合剂将破碎的花瓶碎片重新粘合在一起。

join up
联合起来, 联结起来
例句1, The students decided to join up and form a study group to prepare for the exams.
学生们决定联合起来，组成一个学习小组来准备考试。
例句2, The two rivers join up at the base of the mountain, creating a beautiful natural scene.
两条河流在山脚下联结起来，形成了一幅美丽的自然景象。

just now
现在, 刚才
例句1, Just now, I saw a shooting star streak across the night sky.
刚才，我看到一颗流星划过夜空。
例句2, She was here just now, but she left without saying goodbye.
她刚才还在这里，但没打招呼就走了。
例句3, Just now, I realized how much I’ve grown over the past year.
现在，我意识到过去一年我成长了多少。
例句4, He was just now telling me about his plans for the future.
他刚才在告诉我他对未来的计划。