He was jovial to excess and laughed constantly with and without provocation.

他一天到晚乐呵呵的，不管有人逗他，没人逗他，他总是笑口常开。

They sting or bite without provocation; they fly uninvited into our rooms on summer nights, or beat against our lighted windows.

它们无缘无故地又叮又咬；夏天的晚上，它们未经邀请便飞到我们房间里，或者对着露出亮光的窗户乱扑乱撞。

The victims are mostly adults, attacked suddenly and often without provocation.

受害者大多是成年人，经常会突然遭到袭击，且没有任何诱因。

Venomous without provocation. it's better than being a charity case.

无缘无故的恶毒 -总比施舍好。

But the truth never came to light and the version always prevailed that the royal guard, without provocation of any kind, took up combat positions upon a signal from their commander and opened fire without pity on the crowd.

但真相一直没有浮出水面， 而且一直盛行的说法是，皇家卫队在没有受到任何挑衅的情况下， 根据指挥官的信号进入战斗阵地， 毫不留情地向人群开火。