Manyothernewtechniquesarenowavailablethatenablemoreresearch___(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.

产生感生电动势的非静电力是感生电场对电荷的作用力，产生动生电动势的非静电力是__洛伦兹____力.

时差反应是每个国际旅行者可能遇到的问题。翻译

Thereisnopoint______takingFrenchlessonsifyoudontwanttolearnthelanguage.

Thegoalofthecourseisto___(rich)ourunderstandingofothercultures.