Such events occur only when the external conditions are favourable.

此类事件只有当外界条件有利时才会发生。

《柯林斯英汉双解大词典》

Such events occur only when the external conditions are favorable.

这种事情只有在外部条件有利时才会发生。

youdao

You have to pursue architecture whatever the external conditions are.

你必须不断追求着建筑，无论外部条件如何。

youdao

In this and other areas, Li is proud of steeping himself in the technological basics and the external conditions of whatever business he's in.

FORBES: Thoughts of Chairman Li

The improved external conditions have certainly helped.

CNN: REFORM IS CRUCIAL

Due to its inability to pay its debts and a mutual desire to keep Greece in the eurozone, Greece has had to accept various external conditions from the EU regarding its budget and national economic policies in exchange for forbearance and additional capital.

FORBES: How Debt Limits A Country's Options