1. The captain ordered the men to fall in.
    队长命令士兵们排队集合。

2. The roof fell in.
    屋顶坍塌了。

1. 集合：命令队员集合(Fall In)并带队往上移动. 在搜索办公室之前先检查一下走道. 这是为了避免在扫荡房间时遭到后方袭击的预防措施. 从楼梯旁的<塔荷湖>>(Tahoe)室开始依序进入房间. 本次任务需要从恐怖份子的手中保护外国的重要人士,

2. 填满;填写;(for)替代：fall through 落空,成为泡影 | fall in 填满;填写;(for)替代 | fall out 填写;长胖,变丰满

3. fall in是什么意思

3. 到达,集中：Fall Out:离去,离开行列. | Fall In:到达,集中. | Fill In:补充.

4. 集合/陷入：91fall ill生病 | 92fall in集合/陷入 | 93fall into落入,陷入

1. break down, literally or metaphorically

    e.g. The wall collapsed
           The business collapsed
           The dam broke
           The roof collapsed
           The wall gave in
           The roof finally gave under the weight of the ice

    Synonym: collapsecave ingivegive waybreakfounder

2. to take one''s place in a military formation or line

    e.g. Troops fall in!

3. become part of
    become a member of a group or organization

    e.g. He joined the Communist Party as a young man

    Synonym: joinget together