举起板子之前，确保它是安全的。
A: Make sure that the platform is safe before you lift it.
B: Make sure the platform is secure before raising it.
A: Make sure that the platform is safe before you lift it.
B: Make sure the platform is secure before raising it.
举一反三
- 在顶升飞机之前，确保飞机的稳定性。 A: Make sure that the aircraft is stable before you lift it with jacks. B: Make sure that the aircraft settles before you lift it with jacks. C: Before jacking up aircraft make sure that aircraft stability is ensured. D: Before jacking up aircraft make sure that aircraft stabilization is ensured.
- Make sure the label （标签） is firmly _______ to the parcel before you mail it.
- Make sure the label is firmly ______ the parcel before you mail it. A: attach B: attach to C: attached D: attached to
- Make sure the label is firmly ____ to the parcel before you mail it. A: fetched B: launched C: attached D: reached
- Make sure the label is firmly to the parcel before you mail it. A: attaching B: attached C: inserting D: inserted