" To be under the wire" means to be just in time.

“待在铁丝之下”的意思是准时。

I got in just under the wire.

我都是最后才挤进去的。

Matt pointed to the wire cages under a small window.

马特指着小窗户下的铁丝笼。

The shell will not fit under the wire, and at this point, Snail's getting kinda frustrated because it's not like she doesn't wanna go to the party, but for some reason, Caterpillar just isn't getting it.

壳没办法从铁丝网下过去，此刻，蜗牛感到有点挫败，因为又不是说她不想要去派对，但因为某种原因，毛毛虫就是无法理解。