缘 reason; cause; sake, relationship, edge; fringe

缘分 predestined relationship

血缘 blood relationship

姻缘 predestined marriage

化缘 beg for alms

天缘巧合 a luck coincidence

有人缘 enjoy great popularity

投缘的街坊们 congenial neighbors

天赐良缘 a godsent marriage; a good marriage arranged in Heaven

有缘结识某人 be lucky to get acquainted with sb.

无缘结识某人 have no opportunity to get acquainted with sb.

婚姻是缘分。 A couple's conjugal² fate is prearranged.

有缘终相逢。 Fate brings together people who are far apart.

无缘不相逢。 There is no meeting without predestination.

我与烟酒无缘。 Smoking and drinking don't appeal to me.

好事似乎与他无缘。 Good luck seemed to be wholly denied to him.

他们俩有情无缘。 They are attracted to each other but are not fated to be conjugally³ tied.

机缘凑巧，我找到一份工作。 As luck would have it, I found a job.

千里姻缘一线牵。 Two beings destined¹ to marry each other, though thousands of miles apart, are tied together with an invisible red thread by an old man under the moonlight.

有缘千里来相会，无缘对面不相逢。 As decreed by providence⁴ you have met him; otherwise you might have failed although you traveled a long way.