canaries

1.canaries and their congeners

金丝雀及鸟

2.There’re three beautiful canaries on the tree.

树上有三只漂亮的金丝雀。

3.Buttonwood would like to suggest two tried-and-trusted canaries for this particular coalmine.

金融人士愿意为这个特别的市场建议两个屡试不爽的预警指标。