[ADJ 形容词]外部的；外面的；外来的External is used to indicate that something is on the outside of a surface or body, or that it exists, happens, or comes from outside.
[usu ADJ n]
...a much reduced heat loss through external walls.
大幅降低的外墙热损失
...internal and external allergic reactions.
内外变态反应
externally
Vitamins can be applied externally to the skin.
维生素可以外用于皮肤。
...externally imposed conditions.
外部施加的条件
2
[ADJ 形容词]对外的；与外国有关的External means involving or intended for foreign countries.
[ADJ n]
...the commissioner for external affairs.
对外事务专员
...Jamaica's external debt.
牙买加的外债
...the republic's external borders.
该共和国与外国的边界
externally
...protecting the value of the mark both internally and externally.
维持马克在国内外的币值
3
[ADJ 形容词]外界的；外部的External means happening or existing in the world in general and affecting you in some way.
[ADJ n]
...a reaction to external events...
对外界事件的反应
Such events occur only when the external conditions are favorable.
这种事情只有在外部条件有利时才会发生。
4
[ADJ 形容词]（专家等）外来的，外聘的External experts, for example external examiners, come into an organization from outside in order to do a particular job fairly and impartially, or to check that a particular job was done properly.
[ADJ n]
[mainly BRIT 主英]
externally
There must be externally moderated tests.
一定要有外聘人员负责审核评分的考试。
5
[PHRASE 短语]（药物）外用的 If medicine is for external use, it is intended to be used only on the outside of your body, and not to be eaten or drunk.
[v-link PHR]
Oxford
ex·ter·nalAWL/ɪkˈstɜːnl; NAmEɪkˈstɜːrnl/adjective1connected with or located on the outside of sth/sb 外部的；外面的◆the external walls of the building建筑物的外墙◆The lotion is for external useonly (= only for the skin and must not be swallowed).此护肤液仅限外用。2happening or coming from outside a place, an organization, your particular situation, etc. 外界的；外来的；在外的◆A combination of internal and external factors caused the company to close down.内外因结合导致了公司的倒闭。◆external pressures on the economy外部因素对经济的压力◆Many external influences can affect your state of mind.许多外在因素都可能影响人的心情。3coming from or arranged by sb from outside a school, a university or an organization 来自（学校或机构）以外的；外来的◆( BrE) external examiners/assessors校外主考人╱评定人◆An external auditor will verify the accounts.外部审计员将核实这些账目。4connected with foreign countries 与外国有关的；对外的◆The government is committed to reducing the country's external debt.政府决心减少国家的外债。◆the Minister of State for External Affairs外交大臣OPP
internal
▶ex·ter·nal·lyAWL/ɪkˈstɜːnəli; NAmEɪkˈstɜːrnəli/adverb◆The building has been restored externally and internally.这栋建筑内外均已修复。◆The university has many externally funded research projects.这所大学有许多外界资助的研究项目。externalexternalsex·ter·nal/ɪkˈstɜːnl; NAmEɪkˈstɜːrnl/ex·ter·nal·ly/ɪkˈstɜːnəli; NAmEɪkˈstɜːrnəli/
1outside part relating to the outside of something or of a person’s bodyOPP internal: the external appearance of the buildingFor external use only (=written on medicines which must be put on your skin and not swallowed)RegisterIn everyday English, people usually say outside rather than external:· The outside walls of the building were painted yellow.2effect relating to your environment or situation, rather than to your own qualities, ideas etcSYN outside: Low birth weight may be caused by external factors, such as smoking during pregnancy. influences from the external environment3organization coming from or happening outside a particular place or organizationOPP internal: information from external sources4foreign relating to foreign countriesOPP internal: China will not tolerate any external interference in its affairs.external affairs/relations the Minister of External Affairs5independent British English coming from outside a particular school, university, or organization, and therefore independentOPP internalexternal examination/examinerexternal auditors (=someone from outside who looks at an organization’s finances)—externally adverb: The job should be advertised internally and externally.