1) to be kept upright

必须竖放
2) Pressure opening level

开放必须压
3) You must free the Pegasus, Kratos.

你必须解放天马。
4) must
[英][mʌst, məst] [美][mʌst]

必须
1.
The former means that science cannot completely rid religion of its social meaning; and the latter means that religion must be confined to the ethical sense.
前者说明科学不能完全消解宗教的社会意义,后者说明宗教必须被限制在伦理学的意义方面;科学的性质是"他律"性质的,而宗教是"自律"性质的,如果不区别这种关系,必然导致"二律背反"。
5) It is necessary for sB. to do sth. (It is necessary that ...) ...

是必须的;必须...
6) It is necessary for sb. to do sth. (It is necessary that

是必须的; 必须...
补充资料:冲击波超压与动压