These are all words for a talk given to an audience.以上各词均指讲话、发言。
speech a formal talk given to an audience指演说、讲话、发言：◆Several people made speeches at the wedding.有几个人在婚礼上讲了话。
lecture a talk given to a group of people to tell them about a particular subject, often as part of a university or college course通常指大学里的讲座、讲课、演讲：◆a lecture on the Roman army关于罗马军队的讲座◆a course/series of lectures讲座课程；系列讲座
address a formal speech given to an audience指演说、演讲：◆a televised presidential address总统的电视演讲
speech or address?用 speech 还是 address？
A speech can be given on a public or private occasion; an address is always public. * speech 指公开或私下场合的讲话均可，而 address 总是指公开的演讲：◆He gave an address at the wedding.
talk a fairly informal session in which sb tells a group of people about a subject指相当不正式的报告、演讲：◆She gave an interesting talk on her visit to China.她做了个关于她在中国访问的有趣报告。
sermon a talk on a moral or religious subject, usually given by a religious leader during a service指布道、讲道：◆to preach a sermon布道
Patterns
a long/short speech/lecture/address/talk/sermon
a keynote speech/lecture/address
to write/prepare/give/deliver/hear a(n) speech/lecture/address/talk/sermon
to attend/go to a lecture/talk
Religion宗教
Being religious笃信宗教的
believe in God/Christ/Allah/free will/predestination/heaven and hell/an afterlife/reincarnation信仰上帝/耶稣基督/真主/自由意志/宿命论/天堂与地狱/来生/转世说
be/become a believer/an atheist/an agnostic/a Christian/Muslim/Hindu/Buddhist, etc.是/成为信徒/无神论者/不可知论者/基督徒/穆斯林/印度教教徒/佛教徒等
convert to/practise/(especiallyUS) practice a religion/Buddhism/Catholicism/Christianity/Islam/Judaism, etc.皈依/信奉宗教/佛教/天主教/基督教/伊斯兰教/犹太教等
go to church/ (NAmE) temple (= the synagogue)去教堂/会堂做礼拜
go to the local church/mosque/synagogue/gurdwara去当地的教堂/清真寺/犹太教会堂/谒师所做礼拜
belong to a church/a religious community是教堂/宗教团体的成员
join/enter the church/a convent/a monastery/a religious sect/the clergy/the priesthood成为牧师/女修道士/僧侣/宗教人员/神职人员/司祭