1. 选择：opsonin 调理素 | opt for 选择 | opt 选择

2. 挑选：等于is equivalent to; equal | 挑选choose; elect; opt for; pick; single out | 发出deliver; give out; hand over

3. 选取：In relation to 就...而论 | Opt for 选取 | Out of phase 不同

4. 累积：接受...之美意 embrace the offer of... | 累积 amass, take a detour, elect, opt for, boast about, is barred from | 运用 use, contact with