开朗的微笑 meaning in English

a broad smile

A flying sunny smile rayed in his loose features
他那皮肉松弛的脸上闪过一丝开朗的微笑。
She turned towards him with a serene smile just at the moment he was bowing to her
伯爵向她鞠躬的时候，她带着一个开朗的微笑向他转过身来。
A smile of light brightened his darkrimmed eyes , lengthened his long lips . - the greek ! he said again
开朗的微笑使他那戴着黑框眼镜的两眼炯炯有神，长嘴唇咧得更长了。