这条蟒蛇是一种无毒的大型蛇类，通过缠绕猎物使其窒息。

The boa is a non-venomous ___constrictor that suffocates prey by coiling around it.

喉咙的括约肌在吞咽时收缩以防止食物进入气管。

The throat ___constrictor tightens during swallowing to prevent food from entering the windpipe.

这些繁文缛节就像一条束缚带，限制了我们的创造力。

All these formalities act as a ___constrictor on our creativity.