The interracial roommates spent less time together, and had fewer joint activities than the white pairs.

跨种族的室友在一起的时间很少，而且他们很少像白人室友一样参加共同活动。

The ministry says Russia is withdrawing from the dialogue with Japan on establishing joint economic activities in these islands.

外交部表示，俄罗斯将退出与日本就在这些岛屿上建立联合经济活动的对话。

One example: He reduced the number of joint naval guard activities.

举个例子：他减少了联合海军警卫活动的次数。

Japan has implemented programs that encourage interaction between young and old, such as shared community spaces or joint activities.

日本实施了鼓励年轻人和老年人互动的计划，例如共享社区空间或联合活动。