| 1. | The time expression is not obligatory .
不一定要有表示时间的词语。 |
| 2. | The press conferences were almost obligatory .
这些新闻会议是不得已的。 |
| 3. | Attendance at primary school is obligatory .
上小学是义务的。 |
| 4. | No sooner had we been installed than we were served the obligatory heavy meal .
我们刚刚安顿下来，就要我们去出席例行的盛大宴会。 |
| 5. | The hostess was dressed very simply for a simple, perhaps obligatory occasion .
在这种简单的，也许纯属义务性的场合，女主人的衣着十分朴素。 |
| 6. | 7 transfer obligatory rights and valuable securities
七债权和有价证券的转让 |
| 7. | It is obligatory for us to attend the meeting
参加该会议对我们而言是义务性。 |
| 8. | Wearing a suit and tie at my company is obligatory
在我的公司必须要穿西装，打领带。 |
| 9. | I think it is obligatory on you to protect your family
我认为您有义务保护您的家人。 |
| 10. | A law is not obligatory unless it be promulgated
法律不经公布就没有效力。 |
