companionr和partner,mate有什么区别？

companion侧重于“伴侣，同伴”，partner侧重于“合伙人，同伙”，mate侧重于“伙伴，朋友”

三个单词看上去意思都差不多，但是通过下面的例子你就可以找到差别了。
companion
同伴, 伙伴
成双成对的物品之一
The companion volume will soon be published.
这卷书的姊妹篇即将问世。

partner

n.[C]
1. (一起行动的)伙伴,同伙
They were partners in crime.
他俩是同谋犯。
2. 合伙人,共同出资人
The business is owned by two partners.
这家商店为两个合伙人所拥有。
3. (舞蹈、游戏等的)搭档
The partners all joined hands and danced in a big circle.
舞伴们全都手拉手绕成一个大圈子跳舞。
4. 配偶(指夫或妻)
Are you sure that you want him for your partner for life?
你肯定要他做你的终生伴侣吗?
5. 同居人(中性,既不指出婚姻状况,也不指出性别)
vt.
1. 同...合作(或合伙),做...的伙伴
John partnered Mary at the dance.
约翰在舞会上与玛丽结成舞伴。
2. 使合作,使结伙[(+up/with)]
Jim and Sue were partnered for the dance.
吉姆与苏结成了舞伴。
vi.
1. 合伙;合股;成为搭档[(+with)]
He still partners with Tom.
他仍和汤姆搭挡。

mate
n.
伙伴, 同事
Her mates are waiting for her by the gate.
她的同事们在门口等她。
配偶, 伴侣
She has been a faithful mate to him.
她一直是他忠实的配偶。
(商船上的)大副
The mate is one rank below the captain.
大副是仅低于船长的头衔。
vt. & vi.
(使)成为配偶, (使)交配
Birds mate in the spring.
鸟在春天交配。

三个单词看上去意思都差不多，但是通过下面的例子你就可以找到差别了。
companion
同伴, 伙伴
成双成对的物品之一
The companion volume will soon be published.
这卷书的姊妹篇即将问世。

partner

n.[C]
1. (一起行动的)伙伴,同伙
They were partners in crime.
他俩是同谋犯。
2. 合伙人,共同出资人
The business is owned by two partners.
这家商店为两个合伙人所拥有。
3. (舞蹈、游戏等的)搭档
The partners all joined hands and danced in a big circle.
舞伴们全都手拉手绕成一个大圈子跳舞。
4. 配偶(指夫或妻)
Are you sure that you want him for your partner for life?
你肯定要他做你的终生伴侣吗?
5. 同居人(中性,既不指出婚姻状况,也不指出性别)
vt.
1. 同...合作(或合伙),做...的伙伴
John partnered Mary at the dance.
约翰在舞会上与玛丽结成舞伴。
2. 使合作,使结伙[(+up/with)]
Jim and Sue were partnered for the dance.
吉姆与苏结成了舞伴。
vi.
1. 合伙;合股;成为搭档[(+with)]
He still partners with Tom.
他仍和汤姆搭挡。

mate
n.
伙伴, 同事
Her mates are waiting for her by the gate.
她的同事们在门口等她。
配偶, 伴侣
She has been a faithful mate to him.
她一直是他忠实的配偶。
(商船上的)大副
The mate is one rank below the captain.
大副是仅低于船长的头衔。
vt. & vi.
(使)成为配偶, (使)交配
Birds mate in the spring.
鸟在春天交配。