性格开朗的英文：
be bright and cheerful in disposition
pleasant personality

参考例句：

She had a bright and bubbly personality.
她性格开朗活泼。

She appears quite outgoing .
她好像性格开朗。

He was one of those simple men that love and sympathize with children
他是那种性格开朗的人之一，爱护同情孩子

bright是什么意思：
adj. 明亮的；晴朗的；鲜亮的；欢快的；聪颖的；前途光明的
adv. 明亮地；欢快地
n. 车头灯光

The moon is bright only by reflection.
月亮靠反射发光。

It is bright and fresh in early autumn.
初秋的天气格外明朗清新。

The room was decorated in bright green.
这房间以鲜艳的绿色装饰着。

cheerful是什么意思：
adj. 欢乐的；愉快的；高兴的；使人振奋的

The football fans cheered their team.
足球迷们给他们的队加油。

Cheerful company shortens the miles
旅有好旅伴,不觉行程远

A cheerful wife is the joy of life
快乐的妻子是生活的乐事

disposition是什么意思：
n. 气质，性情；安排，排列；倾向；处置

Daylight will reveal the disposition of their troops.
天亮之后，他们军队的部署就要显露出来。

She has a calm and introverted disposition.
她性格文静内向。

They showed a disposition to sign the contract.
他们表示有签订合同的意愿。