It's our first time to visit our grandparents. Mother wants us to be on good behavior.

这是我们第一次去爷爷奶奶家，妈妈要我们守规矩。

youdao

Reliance on preproduction monitoring: monitoring in preproduction is a good thing, but relying solely on preproduction monitoring is insufficient because user behavior cannot be fully anticipated.

依赖试运行监控：试运行时进行监控是好事，但完全依赖试运行监控是不够的，因为试运行时并不能完全预见用户的行为。

youdao

Act ta rude behavior, not be on one's good behavior in or abuse others in the company.

在公司内，不讲文明礼貌，举止粗鲁，行为不检或辱骂他人的。轲。

youdao

And because Glass is a wearable device that calls attention to itself, you early ambassadors have to be on extremely good behavior.

WSJ: Google Glass: An Etiquette Guide