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1·Inclusion. Foreign material or non-metallic particles entrapped within the metal during solidification.

夹杂物。金属凝固过程中残留在其内部的杂质或非金属颗粒。

2·The seal must provide superior oil inclusion functions as well as being able to exclude foreign materials from the bearing chamber, even during wash-down.

全句的意思应该为：该密封必须有较优的油封功能，即使是在冲洗时，也要能够防止异物通过倒角侵入。