third party
noun /ˌθɜːd ˈpɑːti/
/ˌθɜːrd ˈpɑːrti/
(law- a person who is involved in a situation in addition to the two main people involved
第三人；第三方；第三当事人；第三者 - The assistance of a skilled, sympathetic third party is of great help when marriage conflict gets out of hand.
当婚姻冲突失控时，一个熟练的、富有同情心的第三方的帮助是很有帮助的。
- The assistance of a skilled, sympathetic third party is of great help when marriage conflict gets out of hand.