at the boil

Keep the kettle at the boil.

使水壶里的水保持沸腾.

The soup is at the boil.

汤正在沸腾.

This is an aqueous process, and is sometimes done under pressure at the boil.

这是一个液态加工过程，煮练有时是在压力和煮沸条件下进行的。

The effect of dyeing time, pH value and assistants on dye-uptake and dye depth is explored in dyeing polyester with azide reactive yellow. So the optimum technology of dyeing polyester with the dye is determined at the boil under atmospheric pressure.

研究了染色时间、pH、常用助剂等对自制叠氮类活性黄染料染涤纶纤维的上染百分率及染色深度的影响，从而确定了叠氮类活性黄染料常压沸染涤纶的最佳染色工艺。

Mum told me to keep the kettle at the boil.

妈妈叫我让壶里的水一直沸腾着.