谁能给我讲讲upon的用法rt例如:the declaration formalities may be gone through with the customs in the ports upon the approval of the competent customs in the park.

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谁能给我讲讲upon的用法rt例如:the declaration formalities may be gone through with the customs in the ports upon the approval of the competent customs in the park.
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谁能给我讲讲upon的用法rt例如:the declaration formalities may be gone through with the customs in the ports upon the approval of the competent customs in the park.
谁能给我讲讲upon的用法
rt
例如:the declaration formalities may be gone through with the customs in the ports upon the approval of the competent customs in the park.

谁能给我讲讲upon的用法rt例如:the declaration formalities may be gone through with the customs in the ports upon the approval of the competent customs in the park.
介词 prep.
1.在...之上,在...上面
He laid a hand upon my shoulder.
他把一只手放在我肩上.
2.在...后立即
3.根据;依靠
We acted upon his instructions.
我们根据他的指示办事.
4.接近
5.对着,向
6.(走)上...,(爬)上...
He climbed upon his horse.
他爬上马背.
7.在做...之中
8.关于