sneaking

a. 秘密的,不公开的

James loves sneaking up on his sister to frighten her.

詹姆斯喜欢溜到妹妹身後吓她一大跳。

James love sneaking up on his sister to frighten her.

詹姆斯喜欢溜到妹妹身后吓她一大跳。