admission by invitation only的用法和样例：
- Admission is by invitation only.
- Admission to the exhibition will be by invitation only.
- The Luncheon is by invitation only and is complimentary for GSA members.
- This group is publicly viewable, but membership is by invitation only (for now).
群组分享区 (41 个项目 | 仅会员才可以新增内容至分享区。是否加入？