1. 挤得紧紧的：jam-on packer 卡压式封隔器 | jam-packed 挤得紧紧的 | jam-to-signal 干扰信号比

2. 塞紧的：jam-pack 塞紧 | jam-packed 塞紧的 | jam-up 阻塞

3. 挤紧：jam-free ==> 无干扰的 | jam-packed ==> 挤紧 | jam-to-signal ==> 干扰信号比

4.

4. 塞得紧紧的：jam-pack 塞紧 | jam-packed 塞得紧紧的 | jam-packed 挤得水泄不通的

1. 挤满的；拥挤的
    If somewhere is jam-packed, it is so full of people or things that there is no room for any more.

    e.g. His room was jam-packed with fruit, flowers, gifts etc.
           他的房间里堆满了水果、鲜花及礼品等。

1. filled to capacity

    e.g. a suitcase jammed with dirty clothes
           stands jam-packed with fans
           a packed theater

    Synonym: jammedpacked